One thing that also works is proper layering, with the right clothing you can bind them a bit or create the illusion that you dont have any. For example for a couple of the crossplays I have done i wore a sports bra (nothing fancy just one without padding or anything) and a stretchy tank top that is more like an active wear tank top or a piece of shape wear. The for one of the costumes I wore armor and that took care of the rest and the other I wore a shirt that is a size larger than I am and a vest that does not have any shape to it . If you do it right and take the shape of the garment into account you should be able to use this method.
Im not Obsessed, Im focused