While it may not be the case for EVERY person with ASD, as someone said: it is common for people on the spectrum not to follow current trends. When I was a kid, I always wore things that people made fun of me for, but they seemed like normal clothes to me. I couldn't understand what was wrong with them. I wore boy clothes when I was around 7-10 (some girl clothes too, but lots of boy clothes like my jacket and shoes, etc). People would always ask me why I wore boy clothes. Then when I got into junior high, I wore sweat pants and sweat shirts, or shirts with cartoon characters on them, or leggings. Nothing that was in style at the time. In high school I wore more grungy clothes and was semi-goth at one point (black clothes, but no makeup or anything like that). After high school, I wore nothing but long skirts and shirts that people my age just would not wear. My Mom kept telling me if I wanted to look younger, I would have to wear different clothes, but I was adament about keeping the clothes I had.
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Diagnosed with classic Autism
AQ score= 48
PDD assessment score= 170 (severe PDD)
EQ=8 SQ=93 (Extreme Systemizer)
Alexithymia Quiz=164/185 (high)