I love gcloth for stuffing my pockets. I find it stays in place better than most inserts (rather than bunching up and getting squashed to one side or the other) as it's got a bit of structure to it.
IHA: boys clothes nb-12mos, many different colours of acrylic yarn
ISO: boys clothes 24mos and up, many different colours of acrylic or cotton yarn (sadly I'm allergic to wool (such a tragedy for a knitter
I know lol))