My maxi dress is a couple inches too long, but I'm too cheap for a hem job that likely costs more than what I paid for the dress. So as a quick and easy DIY fix, I pull up the skirt portion, tighten the drawstring waist, then fold over excess fabric. I normally "secure" the waist (to prolong gravity from weighing down the fabric) by adding a belt or knotting the hem of a top. A third method that I've recently re-discovered is to simply tie a shirt around my waist. This brings back flashbacks of wearing fanny packs on childhood vacations but hiding them underneath a tied sweatshirt around the waist due to embarrassment. I find a tied top to be more comfortable than a belt because fabric is stretchier than leather. As a bonus, it's another way to accessorize because I have plenty of shirts to choose from.