I want the same vibe as an older brother in the 2000s

If you ever watched skins, you know that dude, Sid? I desire to be like him but a girl version. The beanie and the overall dingy aesthetic. But personality wise I would die to be like Roderick from diary of a wimpy kid. Weird topic change but my boyfriend has nearly every book. I might steal some of those lol. I think the next time I go thrifting, I'll look out for outfits like that and other accessories. If you can, provide some places to look!