what bra do i wear???? please help

S

i’m wearing this dress next week for a formal event. i just got it in the mail yesterday and idk what kind of bra to wear.

once i tie it, you can literally see my nipples from the top of it.

i bought a sticky bra but you can see it. so that won’t work.

i have small boobs. i wanted some cleavage but at this point i just wanna make sure my nipples are covered.

please help.