Scratchy Dress

I picked up my dress over the weekend and I'm still as in love with it as I was when I first tried it on. My only issue is that the fabric on the inside of the dress is scratchy and I'm nervous that it will irritate me throughout my wedding day. Any suggestions for how to fix this? I know they make slips for under dresses but I really don't want to add any volume or anything to the dress. I thought about wearing shapewear (not for shape but just for relief from the fabric) but it would have to go all the way to my ankles and I'm worried that I will get hot with too much on under the dress. I don't remember the sample being as scratchy so maybe the more I wear it the softer it will get?