Well, I think the first thing that any autistic person should consider for clothing is comfort and then personal attraction to certain clothing and then maybe, if they would like, fashion; however, fashion is fleeting and is subject constantly to change.
Anyway, back to the topic at hand: You said that you do not like goth clothes or edgy clothes. Do you like flowers? I always wear a flower clip in my hair, the same one, everyday. Sometimes I will wear several as I have a collection. I do, however, dress like a child. I am trying to dress a little bit sexier, which usually comes off as more stylish. Tomorrow, when I go on a date with this girl I met online, I will be wearing a pink cotton shirt that clings to my body and a skirt that has the skyline of Paris on it. My whole outfit is pink. However, my usual formula is leggings, usually colorful and always very very soft as I have very sensitive skin, with a skirt and with a soft t-shirt or a sweater or both. Sometimes I will wear a dress over the leggings. However, I am trying out new options, an attempt to diversify my formula by wearing a skirt with knee socks.
Perhaps, you can try wearing skirts with leggings or long dresses. Something that is still girly, but comfortable and flexible. I usually try to curl myself up in balls or move my knees near my chin when I am sitting and skirts with leggings allow me to do this even when I am in public.
However, I do have a trauma based habit of trying to cover up the womanliness of my body, so I may not be the best advice giver. Maybe get a colorful blazer. Most of all, make yourself comfortable and maybe include in your daily wear something you can wear everyday like a piece of jewelry or a hair ornament or a blazer or a bag or purse so that you can have familiar object with you wherever you go.
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"All by myself I am a huge camellia
glowing and coming and going, flush on flush."
-Sylvia Plath, Fever 103