Chair Covers

For all you ladies that are getting or have used chair covers for the big day, did you buy them or rent them? If you bought them, did you have to steam them? Did the RH put them on for you?

I saw a website that is having a sale and I want to order them but I'm not sure if they come pressed or I need to iron out each one.

Any info. is much appreciated. TIA!

Edited for Chair Covers not table linens.