They can be used for medical reasons as well. I had to wear a front closing binder following open heart surgery, but as a medical device it was… primitive… compared to what people have available for non-binary use.

Think the old school whale bone girdles from 100+ years ago! It SUCKED! But it beat having my insides on the outside!

Thought this was an interesting article. They only mention Underworks once which is a shame, though. Underworks is my personal favorite brand.