I love these bandeau bras! Very soft and good support. Beautiful lace detail on the side and back make it nice for muxle t-shirts or dresses with lower cuts. Stays in place and never have to adjust like some others. For reference I wear a size 36B and purchased a size Large for a more comfortable fit (could have fit into a medium if I wanted a bit more snug).
This Bandeau Bralette from Free People is an ok fit, the lace edging at the bottom is pretty but it tends to roll up and not lay flat, you do get some additional support from the flexible bone on either side. Love the color.
I ordered the light pink color. It is much more pink than nude in person. The lace on this bandeau is cute, and the cut is all right - it doesn't cut across the top of the boob too much and give you that visible line that says "I am wearing a strapless bra!" However, I wasn't convinced that this wouldn't shift around during long periods of wear, especially if I was raising my arms or twisting. It was fine, but I didn't love it enough to keep it.