I have no idea why it's so difficult to find underwear that covers my whole bottom!  I bought a 2x in this size when my actual dress size is 14/16.  But having bought a pack of this underwear previously and then returning it for a larger size, I now know that whoever designs most underwear designers assume you want the waistband to be reasonably light-fitting while only covering half of one's bottom!!!  It's so frustrating.  But I have finally solved that problem with this brand: Buy big.
The mesh fabric is light and breathable.  The cut is what I expect of bikini: Below my belly button.