I just got my Underworks 983 binder (size s) in the mail and it’s much more effective than the 997 binder (size m). I’m a 32DD and despise my large chest I get pretty flat. It’s really tight and was difficult to put on, but the result is so worth it.
The picture above is with my binder, a thin tight t-shirt, a black slightly looser t-shirt and a loose hoodie. With the 997 binder layering didn’t work ‘cause there were still lumps.