I saw something in a magazine that I intended to buy but I didn't tear the ad out and I have no idea where I saw this.

It works for the times you wear shoes of different heel heights with slacks.

It's a group of magnet "dots" that are placed inside your pant leg and on the inside of the bottom length of the slacks. When you fold the pant leg inside, the magnets attach to each other and the slacks are shortened for flats or low heels. When the magnets are separated, the length goes down for higher heeled shoes.

Has anyone come across these magnets?