Why don't they trade name sheets......? Why don't they make sheets fit tight on bed anymore? Now that...

Why don't they make sheets fit tight on bed anymore? Now that there are differences contained by the thickness of mattresses, it seem like they engineer all twin, full,queen and king size sheet sets to fit the thickest mattresses best. Which make those of us who doesn't have the thickest mattress contained by the world have lose wrinkly sheets. Has anyone else notice this and does it bother you too?
Answers:    I dont know what theyre called, but i get a couple years ago at k-mart for like 2 bucks, Theyre pliant flat cords with clips on both ends, they progress underneath the bed after you've fit your sheet, you just erect the matress a little, and clip it on, keep the sheets pulled tight with no shifting. only just look in the sheet isle of any store.
LOL... yeah and even if they fit when you put them on they are loose after a couple of night. Beech sheets at Target seem to be pretty obedient.