Do they make shirts/onesies with

the foldover mit for older babies? DS is almost 5 months and is scratching himself so bad in his sleep. His skin is really dry and I feel horrible. I can only find those shirts/onesies for 0-3months. I tried socks on his hands but he gets them off . ANyone have any advice? I keep his nails as short as possible but he digs them into his skin-mostly his head