Something I dont think anyone else has mentioned yet is a washable cover for the face gasket. washing it is a pain and you can never really get it clean. I use these over it and just throw them in the wash after a bit. plus they are cotton and much softer than the gasket.

https://www.amazon.com/gp/product/B07YSNGGYR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Either extra facial interfaces (valve's or the VRcover Leather replacement, according to your preference), or some cloth sleeves you can remove and wash, or both.

I'm prone to sweating, especially with more physically active titles, so these are kind of a necessity, particularly if you're going to be having different people try it out in the same session. The washable covers don't completely block you from sweating through to the HMD cloth, but I'm still happy with them given it's much easier to clean long-term, and they should take the brunt of the 'damage'.