I live in SE Asia too :} super hard to find stores with what I want anywhere !! so I scour instagram for online thrift stores based in my country - usually I don't have to look too hard, they come up in ads on my algorithm occasionally since I look for clothes a lot or I find them by chance ! try using hashtags in the language of your country as well as #s like #scene #emo.
of course, there's also the option of buying from online stores internationally but shipping fees and all that stuff :{ I prefer local clothes because of less fee, but there are a lot of well-priced international stores you can buy from online if you look hard enough !
international online stores popular for their cheap pricing, e.g. shien.... I try to avoid because i've heard a lot about their supply chains -- the news recently has been telling me that they've worked hard to trace the origins of their clothes and go child labour-free, but the scene/emo community is telling me they still haven't done anything and I just don't know what to believe anymore so for now I don't really buy from shein idk i'll look into it more