PVC suit and bags are also a huge turn on. it can be inflated or vacuumed creating a nice prison to keep you trapped in.
I like total encapsulation, so hazmat suits and drysuits are a big turn on. I also like to take an item and pervert its use. So I own a real firefighter suit made by Trelleborg and it is a truly unique experience to try on.
Hazmat - Drysuit
Can you imagine that this suit was originally designed to escape Soviet submarines? Trust me, being tied up in it is a lot of fun.