what are some androgynous black tie options? (summer wedding)

i know i could just do a suit, but i kinda want something in between. i like the vest option, but i want something flattering. it's the first time i feel comfortable not trying to fit in by wearing a dress, so i wanna feel good :,)

the theme is bright and summery, but i tend to look better in earthy tones, esp green and blue. its black tie.

i've been scouring pinterest but it doesn't seem to know what androgynous means... any recommendations would be highly appreciated!!

also-- i'm a very small person, so bigger kids sizes or extra small options are a huge bonus

tyia!!!!!