Baby Shower Outfit

Im looking for something to wear for my baby shower. Im having it October 22nd. I live in Louisiana and I'm trying to find a nice place to buy one BESIDES the maternity store because it can tend to be just so high at times!! Something like a nice maxi dress, maybe with sleeves or without or an all into one possibly. Just in case our weather drops a little I'd be prepared either way. Does anybody have any suggestions? Would Macy's or something have nice clothes for pregnant women that's kinda stretchy to fit me too?