This is a nice slip. I haven't tried it on yet but looks perfect .  The trick is  If you want it fuller, to hang it upside down from a hangar with 2 clips.  straighten out the ruffles. It wasn't too wrinkled but if your  dress in a thin material you may have to steam . For fullness do this upside down as well.
Do not put it in the dryer that will make it limp. [ unless it's too full, in that case put it on light heat in dryer with a  wet washcloth  mixture of water and fabric softener. ] I worked in the bridal business and this is what I used to do  with slips.