It is weird that I have been doing tailoring/sewing/dressmaking for over a decade
And only now am I thinking of buying a dressform (Torso-Onna-Stick).
Part of that's budget, part of it's previous living spaces, clutter stuff, etc. But I should really uh, own one, considering.
(If you're on a tight budget and need one, do what I used to: Get an old top you don't need, a friend you trust, and a lotta duct tape. You can make a cast of yr torso that way pretty easily, it's usually called a duct tape dummy, there's tonnes of tutorials online)