A quilt made from someone's clothes begins with a box of fabric that was never meant to be cut into pieces. A good deal of what comes out of that box is knit: jersey, sweatshirting, the soft cotton of a shirt worn thin across the shoulders. Knit stretches in every direction, which is exactly why it was comfortable to wear and exactly why it misbehaves the moment a rotary cutter comes near it.
Rita, of Mending Moments, takes a real commission through this from the beginning: a client's box of her father's shirts, trousers and track pants, turned into a memory quilt. She works at the cutting table in real time, which is where this kind of quilt is won or lost.
Most people know that knits need interfacing. What is worth watching here is the order Rita works in, and how she decides which weight of interfacing a given garment needs. Get the order wrong and the piece is stabilized permanently in the wrong shape, which is a worse position than the stretchy piece you started with, because it can no longer be coaxed back.
This one covers the preparation: sorting the garments, stabilizing them and cutting the pieces. That is the stage that decides whether the rest goes smoothly, and it is the stage most tutorials skip past on the way to the sewing.
If you want our own written guide to preparing garments for a memory quilt, it is here: how to prepare a shirt for a memory quilt.
Credit where it belongs: the tutorial is by Rita, on the Mending Moments with Rita YouTube channel.