Rubber girl sizing help!

I've been wanting to buy some latex for ages and I've fell in love with the Rubber Girl high waisted pants but I'm having some trouble with the sizing. I am a size 10 and it says small will fit a size 10-12 but I have a pretty big bum/hips. I'm not sure if I would be best going with the small or going up a size and getting a medium. At the size guide my measurements are equivalent to a medium but I am not sure if this refers to the unstretched latex or the size it is suited for. Can anybody help me? I'm really stuck and I want to buy these ASAP.

Thank you so much! I have bought a size Medium (12-14) and I hope these fit! I will measure them before I put them on and if they're too big I will exchange them for a smaller size. Thank you!

If you're a size 10 you'll fit in a size 8 latex outfit quite easily and it will be really figure hugging.