Pockets on Felted Bag

I’m going to put a pocket on the outside of my bag. The directions says to felt everything first then sew on the pocket. Could I sew on the pocket first then felt the bag?

I would sew it on after. Felting is just unpredictable sometimes, if you sew it on first it may distort the shape of the bag.

Sew it on after felting. Felting could result in it felting itself to the bag and closing the pocket if you sew it on first.