I’ve bought this sewing pattern below to make some winter pajamas for my older son. It suggests that flannel is a suitable fabric, but I have some concerns that this pattern is a pullover design and flannel has almost no stretch. The collar is ribbed cotton, which does stretch. I’d prefer to sew it up in flannel for the warmth, rather than a stretch cotton.
Do you think my son is going to have trouble getting this on and off?