it depends on the guy. but most guys would find it really hot if there girl wears their clothes. I personally would find it sexy and cute. you could take it but just make sure he is alright with it first, if he does'nt seem bothered then you can pretty much take it whenever you like
Yeah I love it. Playfully take his sweatshirt from him, or when you guys are together wear his jeans or shirt or something. Definitely a plus, but don't just steal it without his knowledge and keep it from him.