S.,
This is a normal thing that most kids go through. In teaching at the day care, where I have 8 toddlers that are 16-24 months old, we see this all the time. My daughter, who is 20 months, is also in my class, so I am seeing this 24-7! What I have started doing with her is putting her diapers on backwards. She cant undo the tabs that way! When I am having a child at work that refuses to keep their cloths on, I use masking tape on their clothes and still put the diaper backwards. Have you thought about starting potty training? That is one of the signs that your little man may be ready to start, being able to remove their clothes on their own. My little girl started using the potty in my shower(when she was 14 months old)! lol She woke up one morning and told me that she was going "pee" and ran to my walk in shower. That was the sign I needed to know that she was ready...and is doing great(now she uses her own potty seat and not the shower). I would get him a little potty of his own and make sure it stays in the same place all the time, even if it is in the family room where you can see him. Maybe even put it in his favorite "potty spot". This may be the encouragement he needs to get on the right track. It is not to early to start showing him that he should be going on the potty, I have had kids in my class that were trained by the time they were 2. If he is showing this much dislike to being wet or dirty, what is it going to hurt to start him on the potty? :-)
Good luck!