ok, I'm only asking because I've been trying to find one for ages, how did you get a strap on for your plush partner
Honestly I cant talk to much about *his* harness, at least when giving advice to other plushophiles/plushums. I stole it from a hobby lobby in middleschool, the only reason I use it is because it was sitting at the bottom of a box when I moved and I thought "oh wow this would work great!". But dont worry!! There's an easy strap on harness out there that anyone can buy online or in store!
Build a bear boxers! All ya gotta do is put them on backwards! They can accommodate most smaller toys(im partial to the bad dragon lil vibz/squirts). And if you need to accommodate larger toys!(which im sure most people will) all you have to do is cut a few stitches in the circled area, and sew it once its at a desired size!
Another benefit of using these is that they are also just bab underwear! Your partner can just wear them whenever, in fact they might be wearing a pair as we speak!