I would do what chris said then with the bikini top. Or, if you wearing a bra or bikini top, leave it undone and just hold it in place with lots of boob tape. Idk if thats the proper name for the stuff but its how all the girls at my prom were able to wear so little but still keep the goods covered up lmao.
Also is your husband going with you? If you have him there with you then itll make you more comfortable.
When it comes down to it though its really not that big of a deal... The guy has probably done tattoos all over peoples bodies. He's mature, youre mature, he knows youre married, he's not gunna be checking you out.