My ds is 11 and very similar in terms of being an individual and wearing whatever he likes, rather than what everyone else does or thinks he should. He has a wide collection of hats and generally wears one whenever he goes out, other than school. So far he's had nothing but positive feedback from people.
He also has unusual taste in music for your average 11 year old (retro, festival related etc) and his peers have rarely heard of anyone he listens to. Again, mostly positive responses and quite a few classmates actually started to listen to the same music, once they'd heard some of it. He has had some low-level heckling from a lad in the other class this week. He kept calling him a 'nerd', but he just said "Yeah, so what, nothing wrong with that." which completely floored the other lad, who'd expected an argument.
Dh has always been the same. I actually I winced when I saw what he was wearing to work this morning
(I'm pretty conservative in my own fashion choices, but do lean towards the occasional quirky piece or accessory) and ds feels safe to do the same. The other day dh was wearing a rather quirky top and got lots of shouts thrown at him as he cycled to work (mostly just silliness and attempts at funny comments). We discussed it while ds2 was there and he was firmly of the mind that other people's opinions is irrelevant, as long as you're happy with what you're wearing yourself.
He's due to go up to secondary in September and from my experience, that's when they start developing their sense of identity and gravitate to groups that are of a similar mindset. I'm pretty sure ds will find the quirky lot at his school and probably go on to do something creative at college.
The funny thing is that my eldest, ds1, has ASD is as totally the opposite. He's generally disinterested in clothes himself, but does desperately want to just blend in, although is occasionally scuppered by sensory issues. Yet he's the one that's been bullied and had nasty comments made about his clothes.
So ds1, tries to fit in and not be noticed clothes-wise and still gets hassle, whereas ds2 wears all sorts of quirky stuff, really stands out but has never been bullied and is generally liked by all his peers, regardless of their own taste. I honestly think confidence has a lot to do with it.