I know I've seen them before, but I don't know where. Personally, I know of some really nice ones from this website that I go to all the time. They don't lock though, but your daddy can tie them up by their sides, and he can do it tight enough to make it hard for your hands to escape! Here, I'll get a link for you:
http://www.theadultbabystore.com/adult- ... by-mittens
I can personally attest that these are fabulous! I don't have a daddy to tie them for me, but you can still hold onto a ribbon and tie it yourself. I suppose in retrospect, they don't really do the job since you can still pick things up, but the look fabulous and feel wonderful. And then if you tie them by yourself, then you can still get your hands out. I'm sorry.