At work, I've always fluffed up tulle with a steamer. However, I'd be willing to bet you don't have one. ^^;; So, I would suggest removing the bathmat from your bathtub, and dumping boiling water into the tub. Hold the petticoat over the steam. I wouldn't suggest holding the petticoat over the stove. ^^;; But that's just my idea. Maybe someone else has a better one. ^^;;;
ev'ry day i'm gallopin'
Gallifrey One 2014
Proud Member of We're Not Twins! Cosplay