Can anyone tell me where I can find appropriate school slacks?

My 16 yr. old daughter goes to a private school and they require all students to wear a uniform consisting of shoes and dress slacks. The problem is that most clothing stores I go into sell what I deem to be inappropriate attire for a young girl. I do not want lowriders, skin tight, bootcut or see through pants. I don’t know why they market clothes for little girls that belong on grown women or why anyone would want their child to dress like a prostitute. Can anyone direct me to a store in New York or even online that sells nice normal dress slacks for young girls? The color of the pants doesn’t matter, just as long as they are simple, inexpensive, regular slacks. The school said that Khaki’s are fine too. Please help she needs them fast!