Cute but needs drawstring. - Patagonia Paries Bottom - Womens

I know Patagonia swim bottoms well, as I have about 10 of them I use for swimming, surfing and paddle boarding. I like the fit of the paries bottom because they have more coverage, but are still flattering. However, when swimming, I would like a drawstring in the bottom since a couple big waves slid them down showing some booty crack, which I adjusted but I wonder if these will stretch out a bit after wearing a couple months and then be too big in the waist. A drawstring would solve this problem!
For reference I'm a size 4-6 in women's bottoms and ordered size small.

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