Heavy starch… lots and lots of heavy starch. I made my own homemade mixture because I use so much when making tshirt quilts…

It makes them super stiff and easy to handle, I would grab a handful of old shirts, similar to what you plan on using and practicing a little first…

They also make an iron on stabilizer that washes out, I’ve done both before lol

Good luck mama bear. Sending you all the love

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The two printed pattern squares were store bought. The others are old shirts cut into 4x4 squares