I’m a 36 C, typically a size L in tops.
Below is the sizing I wear for each brand
Third Love: 36C1/2 or XL
Soma: L in bra, XL in underwear
Harper Wilde: L in bra, XL in underwear
Skims: XL in smoothing short
Honeylove: L in bra
Lululemon: 12 in bra
LTKMidsize