Contestants’ wardrobes are more deliberate than you may think.Year after year, with each new crop of “Survivor” castaways, it’s easy to see that they’re meant to represent a familiar cross-section of archetypes.Even in their off-the-rack tank tops and cargo shorts, characters like the cranky old military vet, the arrogant corporate executive and the pharmaceutical rep next door are recognizable on sight.That’s no accident: While the conventions of reality TV encourage viewers to believe that these contestants arrive with whatever hastily selected items they can grab, their clothing is carefully vetted and assembled with producers and wardrobe staff to maximally portray players’ personalities and emphasize the show’s “Robinson Crusoe” mise-en-scène.Since it debuted in 2000, “Survivor,” which will soon finish airing its 45th season on CBS, has had an ever-shifting cast and has regularly introduced new twists for contestants as they compete to be the last person standing and win a cash prize. Over time, players’ wardrobes — dirt-crusted and minimal though they may be — have helped further plots and create through-lines in the series, which continues to draw among the highest ratings on network television.Jeff Probst, the host of “Survivor” and its executive producer and showrunner, said clothing was at the foundation of the show’s premise.“The idea is, what if you were shipwrecked with a group of strangers?” Mr. Probst said. “A lawyer’s clothing should look very different from a nurse, who looks different from a pizza maker.”Caitlin Moore, a “Survivor” casting producer, works alongside the show’s longtime wardrobe supervisor, Maria Sundeen, to help contestants select clothes for the show. It involves “a lot of going through the closets, trying to find the pieces that will work,” Ms. Moore said.“We are very much in a collaborative process, working together to come up with what really feels like a reflection of their own personality yet also meets the needs of production,” she added.For “Survivor: South Pacific,” producers asked John Cochran, who was then a student at Harvard Law School, to show up in a sweater vest to play up his Ivy League bona fides.Monty Brinton/CBS‘You Should Wear a Red Sweater Vest’John Cochran was completing his studies at Harvard Law School when he was cast in the 23rd season of “Survivor.” He and his mother were at a mall looking for practical attire that could get him through 39 days without shelter on the Samoan island of Upolu, he said, when he got a call from Ms. Moore.“We were, like, looking at REI camping stuff,” said Mr. Cochran, now 36 and a television writer in Los Angeles. “And Caitlin says, ‘We don’t know what you’re going to think of this, but we’re thinking you should wear a red sweater vest.’”Ms. Moore explained that red would be a color scheme for that season, he said. She was hoping to play up his Ivy League bona fides — and his nerdiness — with the vest, he added.Mr. Cochran initially balked at the request. “I’d never worn a sweater vest before,” he said. “I already exude nerdiness. I’m trying to downplay my ruddy complexion and rosacea and red hair.”Mr. Cochran, right, eventually ditched the pink collared shirt from “South Pacific” and just wore his red sweater vest as a tank top. “That was my ultimate act of rebellion,” he said.Monty Brinton/CBSBut in the first episode of “Survivor: South Pacific,” which was broadcast in 2011, Mr. Cochran could be seen furiously paddling a boat across that ocean in a crimson sweater vest, a pink collared shirt and khakis, the tropical sun beating down on his reddening face.This rather ridiculous image made the impression that Ms. Moore and her team had suspected it would, and when Mr. Cochran agreed to join the cast of “Survivor: Caramoan” the year after, it was a no-brainer that he would show up wearing the same attire.“It was a fun journey to go on,” Ms. Moore said, “and to see him start to lean into it.”Mr. Cochran said he acquiesced to the producers’ vision for his wardrobe partly because, as a fan of the show, he recalled how other contestants’ attire had helped them connect with viewers.He pointed to Rob Mariano, who was rarely without a Boston Red Sox hat in his many “Survivor” appearances, and to Rupert Boneham, another contestant in multiple seasons, who was known for wearing a tie-dyed tank top. (When Mr. Boneham ran a third-party campaign for governor of Indiana in 2012, he evoked his “Survivor” wardrobe by occasionally wearing tie-dye accessories. He finished third in that election, which was won by former Vice President Mike Pence.)“Whether it’s a tie-dye shirt or a Boston Red Sox cap,” Mr. Cochran said, “these discrete, identifiable items become so linked to the person.” His red vest, he added, became “my ‘Survivor’ costume.”Sandra Diaz-Twine spent hundreds of dollars on clothes for “Survivor: Pearl Islands,” but a plot twist that season meant that most of the items couldn’t be used.Robert Voets/CBSLillian Morris, a Boy Scout leader, dressed in a full scouting uniform for the “Pearl Islands” season.Monty Brinton/CBSA Sartorial Plot TwistMr. Probst said that the biggest change to the show’s approach to wardrobe came with its seventh season, “Survivor: Pearl Islands,” which was broadcast in 2003.Before then, each contestant had been permitted a knapsack of clothing items, including some survival gear. But for “Pearl Islands,” the players, who included Mr. Boneham, were surprised to enter the competition with significantly fewer items than they had worked with producers to select.Once cast members arrived at the shooting location, Mr. Probst said, they were asked to dress in certain outfits they had brought to wear for press photos that would be used to promote the show. Mr. Boneham wore his tie dye. Lillian Morris, a Boy Scout leader, dressed in a full scouting uniform. Shawn Cohen, an advertising sales executive, was in an Armani suit.But instead of going to a photo shoot, cast members were plunged immediately into the game, wearing only the clothes on their backs.“Some of the most iconic looks of ‘Survivor’ came from that season,” Mr. Probst said.Sandra Diaz-Twine, the winner of “Pearl Islands,” said she was shocked when she realized that most of the clothes the production crew had approved for her to bring couldn’t be used.“I had charged like $500, $600, on my credit card,” said Ms. Diaz-Twine, 49, who lives in Fayetteville, Ark., and has appeared in several subsequent seasons of the show. “I wanted to make sure that I had a different clean outfit like every day. And then they say you’re jumping off the boat with just the clothes on your back. I was like, Oh my god, I charged all this stuff to my credit card.”Since then, “Survivor” has gone back and forth on what clothing — and how much of it — contestants may bring. “We always listen to players,” Mr. Probst said. “It’s a give and take.”Rob Mariano on “Redemption Island,” the show’s 22nd season.Monty Brinton/CBSBuffs, Underwear and SwimsuitsOne garment worn by all contestants who have appeared on the show is the buff: a scarflike band of stretchy cotton emblazoned with the “Survivor” logo. It is rendered in different colors each season and has become one of the series’s sartorial signatures.“There are clearly guys who have ordered a buff before they go on the show and have put it on in the mirror looking at all the different ways they could wear it,” Mr. Probst said.Parvati Shallow, 41, a recurring contestant who first appeared in “Survivor: Cook Islands,” the show’s 13th season, broadcast in 2006, said the buff is critical for players who have only so many clothes. “You can wear it as a shirt, a skirt, a headpiece, a scarf,” she said.After her fourth and latest “Survivor” appearance, in the “Winners at War” season broadcast in 2020, Ms. Shallow, an executive coach and yoga teacher in Los Angeles, made headlines for criticizing the show’s dress code on a podcast hosted by another “Survivor” alum. She said she was pressured to compete in her underwear rather than the bathing suit she had requested. (In the seasons before “Winners at War,” producers began to discourage wearing swimsuits.)“It was a point of contention with me,” she said in a recent interview with The New York Times. “I went back and forth with wardrobe. They said no, nobody was getting a bathing suit.”She ultimately went with patterned undergarments that gave the impression of a swimsuit, but said it was not a happy compromise. “I had just had a baby,” she said. “I was like, My body looks nothing like it used to look like.”Mr. Probst said in an email that Ms. Shallow’s characterization was not accurate. He added that the choice to move away from bathing suits on the show was a creative one. “‘Survivor’ wardrobe has always centered around the conceit that the players were shipwrecked and left only with the clothes on their back,” he said.For Ms. Diaz-Twine, returning to “Survivor” after winning the “Pearl Islands” season offered the chance to upgrade those clothes. In preparation for the show’s 20th season, “Survivor: Heroes vs. Villains,” she said, “for the first time ever, I bought a Victoria’s Secret bra.”“I won a million dollars,” added Ms. Diaz-Twine, who will appear with Ms. Shallow in the second season of “The Traitors,” another reality TV competition, which will be released in January on Peacock. “I can’t show up in panties from Walmart.” More