Bill- His flannel. He always thought you looked adorable in it and would always blush when he sees you in it.
Richie- His hawaiian shirt. He loves when you steal his clothes so he can show everyone that your his.
Eddie- His red shorts. They would be kind of long on you and he absolutely loved it. He would let you wear them all the time.
Stan- One of his shirts. It's long on you since he's taller than you. He loves it but he won't admit it to anyone.
Bev- Anything and everything. You guys would share clothes, jewelry, hats, etc. Mainly items you wear.
Jaeden- One of his sweaters. You usually wear it when he's away filming. Or when you just miss him at random times.
Finn- One of his band shirts. I imagine he loves wearing band shirts and you would always take them because he would wear them a lot and it would start to smell like him.
Jack- Beanies/hats. You know Jack usually loves wearing hats and you love seeing him react to you when you take one.
Wyatt- Pajama pants. I know it kind of sounds weird but they would be so soft on you and so comfy that you would just take them from him everytime you came over to his house.
Bev- Shorts or perfume. I feel like you would love the way her perfume smells. And you just love sleeping in her shorts.