I stole my non-blood-related sister's clothes and use them for my own private enjoyment.
Wait what? How many times have you done that? Did you even ask her first?
I took her clothes five times without asking her.
Its nice to have someone that you can share clothes with, but taking them is your bad idea of sharing. This stealing thing you have, it can make people hate you. Quit doing it before your sister starts to call the cops when she sees her clothes on you.
I would share, except my clothes don't fit her. She won't call the police because she's too lazy.
Whether or not she would call the cops, it's still wrong to steal, even if you claim it's sharing. Sharing would require consent on her part. If you want to share things, get her permission to use her clothes and find something besides clothes that you can share back if your clothes don't fit her.