Size up! They're so good, suck you in and are super warm! Comparable to my spanx! And under $25 (funky smell when they first come in but spray 'em down or throw em in the wash and you're good to go) they wash well!

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Commissionable links
Faux Leather Leggings Womens High Waisted Stretchy Pleather Pants Butt Lift with Fleece Lined Leggin | Amazon (US)