As it is, you can't add the same decor to a lion/lioness twice. It gives you a little message saying the lion in question already has that decor equipped. I propose an adjustment to this: have the message, but have an 'add anyway' option.

I want to put ten Moonlights on a lioness, and I was going to because one of my clans has a lioness we pass around and put a ton of decor on and really try and make her look as awful as possible, and this stopped me. Please. I need this.