Double-lipped bag: Double-slit digging bag

Some people vividly call it single eyelid and double eyelid.

Usually, the back pocket of trousers and the lower pocket of coat are double-stitched, and a pocket cover can be sandwiched in the middle (see the figure in the lower left corner).

Suits, handkerchiefs and bags are all single-stitched. (See the picture in the upper right corner)