I've wanted to invent modular clothing where a lot of the pieces are interchangeable so you just zip off the legs and zip them to your shirt on case your arms are cold but your legs aren't.
Okay so I was going to post a link to a Lego set as a joke but I can't remember the name of the theme. It was this set where these aliens could shape shift by swapping their arms and legs with other aliens. The joke being that arms and legs were interchangeable.
You could then simply zip off some more from your belly fabric and append-zip it on your arms. Or if you're even colder, zip it on your neck to get a polo neck. Hell, ideas are coming in!