>>1255921Only reason I know about blanket/button-hole stitching is because I use it to keep the edges of holes and tears in my shitty old jeans from fraying any further.
Hard to tell from your photo but I think I see something similar on your left sleeve cuff. Likely it was around the entire outside edge of the original blanket.
Haven't made a whole garment like you in years senpai ¯\_(ツ)_/¯