That being said, this is my favorite halloween costume ever. And it got amazing raves at all the parties!! I think one of my favorite aspects is that (despite being ridiculously easy and cheap) it can be adjusted to fit just about anyone's needs.
So it may be a bit obvious that I'm a die-hard Ohio State Buckeyes fan. I decided a few years ago that I would spoof our rival team's cheerleader, a team who was having a particularly rough year. It was one of the few costumes where being a little over weight actually worked in my favor. Since the team was taking a real beating on the field, I figured the cheerleaders would be a bit bruised as well.
First step was the makeup. I used a $2 halloween makeup kit from the clearance rack for the black eye and the cut on the right cheek. It was pretty much a paint-by-numbers job, copying a black eye and bruise I found on google image search. Seriously, just google "black eye" and "road rash"... you'll find some great templates. As a general rule, less is more. Colors are much more realistic than darks... the old school black shoe polish is nice, but just not realistic.
I added a couple "road rash" burns to the inside of my nose and outside of my cheek (lightly pressing the thick-pore sponge that came with the kit on my face, don't smear or brush). The black out teeth looked good from a distance. This whole thing required no fake skin or clay appliqué or any other irritating details that are difficult to wear during a long night. My guess would be that anyone with an extensive makeup drawer could do this for free.
For the rest of the makeup and hair, trashy is key. I thought white lipstick with black lip liner worked well. For hair I teased pigtails. Then added super-hoop earrings for an extra kick of situation-inappropriate "low life".
The costume was the easiest and cheapest part. I got a $4 Old Navy long sleeved tee in the right color, then added a felt sticker cut-out of the team logo that I cut from an online template of the logo... I just outlined the blue letter with yellow fabric paint. The skirt was the only piece that actually cost "real" money, and I bought it online from a cheerleader outline store for about $20.
The shoes are matching yellow stilettos... with socks, for extra class. I also wore pantyhose since it's cold here in October. It made it easy to draw on trashy tattoos (i.e. "Go Blue").
I apologize in advance to any fans of the Team Up North... but I assure you, just switching the colors makes it easy to adjust this to any team or sport you like!