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Use "underbust" in a sentence
"Star Wars Waist Cincher – If you are in love with this underbust cincher, grab it fast."
"Steampunk Map Corset – This underbust corset is made in Victorian fashion and is sure to catch attention from more than just cartographers."
"My measurements: almost 32" bust but the measurement is only that big because of how V shaped my ribcage is - I am a 30 or 32 A/AA, almost 27" underbust, 23.5" waist, 31" high hip, 35" low hip, 33" around the tops of both thighs."