The lace up style is currently one of the most popular trends around - lace up tops, dresses, flats, skirts, you name it. Lauren Conrad has a really good round up here. Lace up details so effortlessly make any outfit more stylish. I'm wearing a linen dress from Reformation (sold out :( , but you can shop similar styles below).
Because regular bras don't work under lace up tops or dresses, so I usually just wear stickers (#smallboobwins). So breezy! You can find tons of stickers on Amazon - there are the reusable silicon ones and disposable paper ones. I prefer the latter because its easier and usually has more sticking power, and the silicon ones require washing after each use to keep the glue sticky (and it's usually not that sticky anyway).
Shop similar styles here: