8th grade dance help....please?

Okay, I'm going into 8th grade. At the end of the year, they have "8th grade prom", which is really just a formal dance, but everyone wears prom dresses. The dresses are usually short (knee length or shorter). Well, I'm kinda worrying about it. I have HUGE thighs. My waist is small, and my calves look okay, but my thighs are gross. I would feel terrible wearing anything that exposed my thighs at all. So I'm thinking knee length or a little bit longer. The only problem is, the only cute dresses are a little shorter than knee length. I've started doing squats, in hope that my thighs will look better by then, but if they don't, I need a place where I can find cute knee length or slightly longer dresses. The best colors on me are green or black. Definitely no white, purple, blue, yellow, or pastel pink. Hot pink looks okay on me, so a hot pink dress would be fine. Send some links of cute dresses that are at least knee length, but not ankle length, that are hot pink, green, or black.