Compression clothes for hyper mobility

Hi I’m looking for sites to order compression clothes for my 5 year old son, he struggles most with his ankles, knees and hips, he refuses calpol, he’s a climber with a lot of sensory issues his sensory profile mentions proprioception, vestibular and Interoception, since his bowel movement problems started in October it’s nearly impossible to get clothes on him and get out so we can stick to his routine, he’s recently had his hyper mobility diagnosis and it mentions secondary musculoskeletal pains, he’s pre verbal but I’ve known he was in pain with his legs for some time now so he has two baths a day to help with pains, also 1-1 swimming lesson in a hydro pool once a week, he’s starting physio soon but if anyone else has any tips on the clothing side or anything reassuring I’d really appreciate it, x