What should i wear meeting my boyfriends parents for the first time?

his mom met me very briefly and said i was very pretty and seamed nice. but tomorrow i am going to my boyfriends house to hang out all day and meeting his whole family. it going to be warm out so i was thinking mid length white shorts, a black tank top, and a light pink cardigan that is thin has long sleeves and is very long, it just covers the back all of my shorts in the back. i would wear this with black gladiator sandals. and only wear mascara and no jewelry. do you think this would be good or do you think i should wear a different shirt because the cami might come across as "slutty" even though you cant see my shoulders or bra straps. oh and im 15 and im not going to wear a dress or skirt because i never wear them and i would look like i was trying to hard please help im sooo nervous! i really like my bf so i want his mom to like me! and his dad to but his dad isnt hard to impress