Sew-on snaps: no more bra line

Target's summer dress collection has been extraordinary this season! In just the strapless summer dresses collection (with pockets) I have obtained all, but 2 styles! They're super cute, with pockets, of course; and are the perfect length. I find that most dresses from stores like Forever21 are too short, to be worn with class (personal option).
Anyways, these dresses are great, except for the fact that my strapless bra always hangouts the back.

Solution: Sew-on snaps. I sewed two on my bra 6.5 inches apart, no specific rhyme or reason to the distance, and then on the inside of my dress at the same distance.

Mistake: First time I sewed on the 'female' side of the snap, I sewed it in backwards, so I had to cut them out and re-sew, luckily there was only two snaps, so it took half a minute.

Thoughts and future suggestions: On my next strapless dress, I will sew the 'female' end of the snap down about 3/4th's of a centimeter, in order to make sure the back of my bra isn't showing. (Previous trial: I sewed right at the top hem and it was a tad-bit too high and still showed bra when sitting).

Overall: good lesson on snap placement. Useful when wearing a summer dress with an outrageous colored strapless bra. Easy fix.