Unstitching a garment by manually unpicking the stitches is a problem for the recycling industry. In the clothing business, such activity is done largely by sweatshop labour.
Today’s invention is an unsewing machine.
A section of stitches to be unpicked would be marked with eg an ultraviolet ink at the start and end.
This section would be inserted under the cutting head which would be fitted with a small camera.
The material would be propelled past a small blade. This would be guided, by the camera, to snip any stitches (ie threads larger in scale and/or of a different colour from the main material).