I don't know what your sewing skills are... Ish Wish's suggestion of ren is good - so is Medieval as the dresses are very flowy and drapey.
You could also make a hooded cloak - they are actually not too complicated.
OR you could go with a wench or gypsy type of costume, with the red used as the "overskirt". They are hiked and gathered which would make the most of the fluid-ness.
http://www.butterick.com/item/B3906....ostumes&page=7