If it’s uncomfortable, don’t try to make it work; nothing looks and feels worse than underwear that doesn’t fit
Sheer mesh lace is best for wearing any sort of sheer or silk top; lacier styles will show through the fabric
Color is fun and meant to be seen; wear neons and brights in the summer under backless tops and jumpers
If you’re going to be photographed, wear a nude bra, even under black—camera flashes will cause black bras to show through even denser knit tops
If your bra is going to be visible under your tank top, make sure straps are not twisted and take care to properly launder your bras—nothing is worse than seeing a dingy strap