I think it's perfectly appropriate. It wouldn't look good on me so I'd never wear it but on the right person I think it would be exciting and flattering. It's very fashion forward. Your SO may be used to more subdued dresses but if you can carry it off, it will be a standout.
Are your reasonably tall and slim?
I'd avoid this color/pattern if you are a redhead.
Keep accessories simple. Maybe silver hoops.
If you answered all the above correctly (LOL) - go for it! It looks like a dress someone would wear who loves to have fun.
2/c and some 3A. Modified CG.
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Protein treatment HG: Curl Junkie Repair Me
Conditioners: Curl Junkie Beauticurls Strengthening Conditioner,
Deep condish: Curl Junkie Curl Rehab
Stylers:Curl Junkie CCCC or CCCL
in combo with a gel, usually KCCC
Trying Curl Keeper - still experimenting
Every day is a gift