I've finally made Ryu a little harness so he can explore and I'll be at peace, since I worry about him escaping.~ I thought it'd be hard to get it on him, but it actually fits, works, and comes on easily! It also comes off easily as well(he typically slides out once I take out an arm).
I can draw a tiny little blueprint if anyone else wants to make their leo one. It's relatively easy, though I made a few mistakes and had to remake about 3 times. Ryu's is made out of soft fleece(I think).