I'd see what the effect on people was over a while. You're going to be wanting to make new friends I assume. So if you keep attracting people who are like gangsters in their behaviour and who you don't vibe with, while all the quiet and sensible kinds of people you'd prefer to hang out with more are avoiding you because of how you look, then I'd consider changing my style a bit at least for the occasions where you're going to be in a situation where friends are more likely to be made.
The old lady in the charity shop was probably just being judgemental though. I mean I can understand her thinking that but who comes out and says it? I believe things happen for a reason so maybe the universe put her in your path so that you'd consider how you come across to others at this time when you're needing to make new friends.
I'm not familiar with the clothes you describe so I don't know if you look gangster but I don't really care what people look like I'll decide if I like them after I've spoken to them and seen how they behave towards people. Some people do judge on appearances though and can be harsh with their judgements. How you dress can definitely affect how you're treated. I think that's why so many people dress all the same, nobody wants to stand out for fear of being unfairly judged in some way.
If you're unsure if your clothes are causing you negative experiences, you could run some experiments wearing other styles to see what effect it has. I mean maybe you don't want to take style advice off that charity shop lady, but it would at least have been interesting to see what she recommended, if you'd asked her what she'd wear if she was you.
I do a similar thing with music. Asking friends and also people I don't know all that well what they'd suggest I buy, then I go look it up and mostly I like it. Means I get to hear things I'd never otherwise hear.
Other people's opinions can be interesting even if you decide not to go with their ideas. I know you're asking us on here but we can't see you, so we're talking in a general sense. People who you're asking IRL might have more specific recommendations on what might suit you.
On your other thread you said about phones. You know the location and "find me" can be turned off so people can't track you? The emergency services are the only ones who track what phone masts your phone connected to and that's only if they have a reason to go looking for you. If you're not a criminal and haven't met with an accident or gotten lost for an extended period of time, nobody is going to be searching you by your phone. Lots of people are turning away from social media platforms so making friends and maintaining friendships might be more difficult if you don't have a phone.