I'm plus size and can be very self conscious, especially as I'm covered in really bad stretch marks and hate my tummy. I absolutely LOVE bodies! They look amazing on, smooth everything out, give great shape... for me it's instant confidence! I would absolutely say go for it 😃
If you are talking bodystockings then I would 100% go for it.
If you are talking body, then be a little careful as sizing can be difficult - I have not yet found a body that fits me, but bodystockings fit me 90% of the time.
As the others have mentioned, it's a bit difficult without knowing her size. If she's plus size I can definitely help you more than if she's not. Are there any specific things about her body she's self conscious about? Some body stockings/bodies are better for some areas than others.
I love the two VioletWolf has posted, beautiful colours!
Bodies and bodystockings tend to be very flattering. Lovehoney have loads - have a read through the reviews before buying and you'll bet a flavour for the product and which body sizes/types it suits, etc.