Cosabella Never Say Never Curvy Sweetie Bralette
My second favorite is this Cosabella Never Say Never Curvy Sweetie Bralette ($28-$98). This bralette comes the closest to the lift of a regular bra but is at least 10 times more comfortable as it goes right over your head with no clasps. (If you prefer additional support, there's also the same exact one with a traditional closure found in this Cosabella Never Say Never Curvy Sweetie Hook and Eye Bralette ($25-$70) instead.)
Because the straps are adjustable, it tightens up to be even more supportive as needed, and I opted for the medium as it was just slightly looser around my ribs. As you can see, there's less definition here when compared to a bra with two separate cups, but it's still not shelflike as sports bras tend to be. It's easily become my favorite for lounging and (will be great for) long plane rides, too. Plus, like the racerback style, the "Sweetie" is available in a noncurvy version as well.