Sashiko on T-shirt fabric?

[u/SpookyVoidCat]

I’ve got all these holes in my work T-shirts, but I’ve never done mending on stretchy fabric before, only denim or cotton - is there something important I need to do for mending this type of material? Should I use a similar stretchy fabric for the patch or do I use a stable layer like cotton? All advice gratefully appreciated!

[u/manicmender76]

I've patched multiple t shirts using a whipstitch or sashiko. The key is to use a similar fabric.