+ 1,000. Why, oh why do manufacturers of "cycling" pants cut them low in back or, alternatively, with high crotches? I've owned any number of high-end and low-end cycling shorts, knickers, and long pants that, this defect apart, would have been wonderful, but instead cut them like low-rise street pants.
One recent offender is the pair of Osloh cycling jeans as heavily advertised by Bike Snob. I had to pay a tailor ~$100 to have the waist pinched to get a halfway-decent fit -- her work did not solve the low waistband, but it did make the waist snug at the back, thus less liable to dropping. (And, I had her remove some of the superfluous "cycling" adaptations, like the useless chain pad on the inside of the right ankle -- they sewed in a snap-fastened ankle cinch; if that works, why the pad??; and the stupid doubled rear pockets which just make it hard to get your wallet properly placed.
OTOH, the pair of Nordstrom medium wool flannel dress pants that I had converted to cycling dress knickers fit wonderfully, because they are high rise; not 1940s high rise, but Jack Kennedy high rise, so that when you drop down into the hooks, your back remains securely covered and insulated from cold drafts between waistband and jersey hem.
My early-edition Riv knickers weren't the worst offenders, but they were cut needlessly low in back. I sold them on for this and various other cycling imperfections, at least to my taste.