My "hazmat" suit includes a shower cap (or this last time, I used an old t-shirt twisted over the top of my head), goggles, a mask, and then a full set of old clothing over my actual clothes - long sleeved shirt, pants, and socks, all tucked into one another. Thankfully hubby's clothes are the perfect size to wear over things for me.
When I'm done I peel it all off outside and throw it directly in the trash, all except the goggles, boots and gloves. It's so filthy, I can't imagine putting the clothes in the wash.