I didn't think a diaper would work but the belly band work really well for markers. There are a lot of people that make and sell them on here but I'm a little bias when it comes to buying and would suggest that you purchase from YHR. Your purchase will benefit the YHR pups and you will have a fashionable pup to boot.
If you have more questions just PM me and I will help you whatever way that I can. But you need to buy several because you will need to change them if he pees on them. I use them when I bring a new pup home since they have a tendency to mark then.
He shouldn't be able to rip it off because they have a velcro closure that is pretty tight. Diapers are made of paper and belly bands are fabric.
Belly Bands :: Yorkie Haven Rescue Boutique