74 lb weight loss

In the last year I’ve struggled a lot with my weight. I became anorexic and really just hated myself for a long time. I’m feeling a hell of a lot better now however I was just asked to prom by my boyfriend (the sweetest boy in the world I swear) and I’m feeling very self conscience as to what i’m supposed to wear.

I’ve lost 74 pounds and I’m unsure as to even what size dress I am. I want to look and feel good but I don’t know how. I was thinking about this dress but idk if it’ll look good on my body type.

I’m so used to my old body that I’m not sure if i’ll be confident enough.

This is what I used to look like and idk if the difference is enough to pull something off like that.