Anyone have a pattern for "GROW" mittens?

My sister has an alpaca farm. No I don’t get free yarn but she is interested in a mitten she saw that was a grow type mitten. I guess they are stretchy.
Anyone know of such a thing?

the only ones i have seen were made with elastic yarn
Cotton Elastic blend
I used some to make a pair of leg warmers for my daughter
She promises she will love them when she gets them at Christmas

sorry, best I can do


Thanks ECB for your help!