Одежда, естественно, не является 100% знаком. Однако, как правило, в обществе, где [слово запрещено РКН 12/2022] никак не преследуется,
в среднем наиболее эксцентрично одеваются как раз люди [слово запрещено РКН 12/2022]. Т.е. да, в данном случае тут можно рассматривать это как намек от автора.
А что касается фиолетового цвета, то да, он был связан как раз где-то в 19-20 века с [слово запрещено РКН 12/2022].
Update: мне стоило сказать конкретно лавандовый.
Вот, например, перечисление некоторых исторических моментов, касающихся лавандавого цвета.
Towards the end of the 19th century, however, the public began linking lavender with homosexuality. Aestheticism, a European arts movement was founded, eschewing Victorian wholesomeness and the perceived ugliness of the industrial age, in favor of beauty, passion and "art for art's sake."
Newspapers denounced Aesthetes as effeminate, not least one of the prominent leaders of the movement, Oscar Wilde, who frequently reminisced about his "purple hours" spent with rent boys, and provoked a moral scandal with the homoerotic themes in "The Picture of Dorian Gray."
The 1930s marked the start of a dark period when lavender was cruelly lexicalized. Gay men in America were taunted for possessing a "dash" or "streak" of lavender, thanks in large part to Abraham Lincoln's biographer Carl Sandburg, who described one of the president's early male friendships as containing a "streak of lavender, and spots soft as May violets."
During the McCarthy era, there was state-sanctioned discrimination when president Eisenhower signed Executive Order 10450, which became part of a national witch-hunt to purge homosexual men and women from the federal government. Dubbed "The Lavender Scare" by historian David K. Johnson, the suffocating climate of fear and suspicion subsequently led to around 5,000 federal agency employees losing their jobs on the basis of their sexuality.
In 1969, the color came to symbolize empowerment. Lavender sashes and armbands were distributed to a crowd of hundreds in a "gay power" march from Washington Square Park to Stonewall Inn in New York, to commemorate the Stonewall riots that had just taken place a month before.
It was also the year president of the National Organization for Women, Betty Friedan, denounced the lesbian membership she believed would threaten the feminist movement as a "Lavender Menace." This time, there was backlash. At the 1970 Second Congress to Unite Women, a group of radical activists wearing hand-dyed purple T-shirts printed with the words "Lavender Menace" stormed the stage and kickstarted a conversation on the very topic Friedan had struggled to suppress: lesbianism.
А вот прямо сказано, что он [слово запрещено РКН 12/2022] не было.
А то это все равно, что на примере старика-миллионера Осгуда ("у каждого свои недостатки") из "В джазе только девушки" делать выводы, что в конце 20-х годов в Америке тоже была свободная любовь вне зависимости от пола, и среднестатистическому мужчине было все равно, если его девушка вдруг окажется парнем. 
