Whether you call them cheerleading bloomers, spankies or cheerleader briefs, this is one piece of equipment you cannot live without!
Cheerleading bloomers, generally referred to as "spankies" in cheer speak, are most often made of some combination of Lycra and polyester and will have the feel of spandex.
To put it plainly, you are not really being modest if you have your underwear hanging out of your spankies.
With that said, some girls, especially those who are very new to cheerleading, find it very uncomfortable to wear spankies by themselves.
If you must wear underwear, wear undies that are cut in such a way so that they don't peek out of your spankies.