Fabric books are my daughter’s favourite other than her matchstick monkey. She also loves chewing on the ears of her soft toys
I know the feelings! My girls obsession at the minute is stealing the flannel we use to keep her warm in the bath to suck on, it's gross😂 we take it off her then she finds it with her feet and flicks it back up to her hands!😂
I was recommended tying the muslin in a knot for a harder bit to chomp on and put one in the freezer!
Have you looked into muslin comforters? May be an option you may also be able to attach a silicone teething toy to one which might make it more appealing?