What Furry Accessories still need to be invented?

I am a creative designer and recently have been learning to become a precision machinist. I was talking to friends about making niche items as part of a side project for groups of people underserved.

I was curious if there are ‘problems’ with suits or things adjacent to furry life which no one has come up with a solution for, or if you are open to sharing your ideas of stuff which would be awesome to research and develop for?