You’re also right that fit is only a part of the picture, and even the terms fit and style don’t quite capture what’s really going on you really want to see what clothes are going to look like on someone who looks like you and dresses like you (same preferences for fit, style, etc). Again, hard as B2B for sure.
I’ve been working on a B2C solution in this space for a while (fitfirst.app)…all too familiar with the nuances and intricacies in this space.
Fun fact and totally tangential: if you have two clothes with the exact same measurements and material that are dyed different colors, the darker dyed version tends to feel tighter than the lighter dyed one. Has to do with how the dye feels on the skin. It’s a nuance you can’t get from a photo or rendering.