The story
From diaper + corset (“woman's foundation garment, reinforced with stays, that supports the waistline, hips and bust”).
Etymology from Wiktionary, CC BY-SA 4.0.
diaper corset
dia·per cor·setToday it means: In art and fiction, a diaper shaped and stylised like a corset that covers the crotch and torso, entirely absorbent. Full definition →