By 'fashion' help do you mean 'going out' clothes?
I suppose you need to cover your arms and the top of your legs, but need to create an illusion of a bust and hips. Do you need to cover a stringy neck, and do your collar bones stick out?
Margot Fonteyn managed to look elegant and beautiful as she aged although she was shorter than you, but look at photos of her and see what looks Good and what doesn't. Sometimes she looked really hagged and very much like a whitch so work out if that outfit would do the same for you.
Also some photos of Diana at her thinnest can give some pointers, she always looked good.
I' e lost weight, through illness, but am managing to gain some now. Full fat everything.
Take selfies and be really critical.