trapeze dress
n.— «Phelps said the minidress look for spring is what’s known as the “trapeze dress,” which mimics the outline of, not surprisingly, a trapeze—in a boxy, trapezoid shape that’s narrower at the top and wider at the bottom and has a high waist or no waist at all.» —“The Minidress Is Back… If You’ve Got the Legs for It” by Catherine Donaldson-Evans Fox News Mar. 29, 2007. (source: Double-Tongued Dictionary)