Bachlorette Party

I know this seems kinda silly and i have to ask because i have never done or been to one. Is it okay to ask the guests to help pay for their part in a bachlorette party?? or is this something that has to be completely paid for by the host? i would like to have everybody chip in $20.00. It is only going to be a girls night in.......kinda a pajama party but a lot more relaxing. I would like to be able to make each guest a pair of slippers and bath robe for this but i am looking at about $25.00 a piece plus all of the food. I have to throw a shower and a bachlorette party for the bride and i don`t have a lot of cash to do so. Any advice would be appreciated.