Green’s Dictionary of Slang

women’s wedge-heeled shoes.

1940		Mademoiselle Apr. 13: Your wardrobe is . . . without a pair of wedgies.
1951		Cusack & James Come in Spinner (1960) 27: She threw off the crumpled linen uniform and stood there in scanties and brassière kicking off her white wedgies.
1962		C. Clausen I Love You Honey, But the Season’s Over 177: Maxine [...] didn’t feel secure if she was any higher off the ground than her wedgies.
1977		C. McFadden Serial 32: Joan had started off for Tam high in her halter top [...] her platform wedgies and not much else.
1999		T. Dorsey Florida Roadkill 187: ‘Look at all the wedgies,’ said Coleman.