Hello,
Congratulations on trying your first competition. It can be lots of fun and a bit overwhelming the first time. You will see so many beautiful gowns it will take your breath away!
I have been dancing for over a year now and have tried many different ways to dress....hope my experience can help you....
First, for a first competition... I'm sure your teacher has told you to dress simply. That is good advice. For my first comp, I wore a black full circle skirt with a bodysuit, no stones, black "gauntlet" type gloves and lots of rhinestone jewelry. I used a long skirt for smooth and a short skirt for rhythm, both very full with lots of movement. I recieved many compliments on my outfits because they were simple and elegant. If you want to apply stones it will give the dresses lots of sparkle...but it is kind of tricky...it takes some practice. If you have plenty of time before the comp, then you might want to try stoning the dresses, but I personally would wait. Here are some tips about stoning a dress. I would use swarovski stones, they give the best shine. Korean crystals do not give as much shine and I don't like them...they looks kind of cheap. I use a glue called gem tac (from craft store)...some people use E6000 (Wal Mart) but I find it too stringy and difficult to keep clean and neat. The trick to applying stones is to put only enough glue on the back in the middle of the stone to grab the edges when you place the stone onto the fabric. Use tweezers to place the stone on the fabric, or put your dot of glue on the fabric in the design you want. Use a toothpick to do this. BE very careful about stone placement because once the glue is on the fabric, it will darken the fabric. For the first time stoning a dress, it might be easier to just do a scattered stone pattern. When choosing stones, I personally like to choose stones the same color of the dress,,,rather than clear crystal, which can look to polka-dotty.
If you have the time and a small budget you can try a website called rainbowshiu to possibly purchase an entry level dress. she has some dress on an ebay site, but I would order one from her custom made. The ebay dresses are samples and have only Korean crystals. I don't care for the Korean stone. It will cost between 200 to 300 dollars to have a dress custom made and it can be rushed (you could have it in about 2 weeks) I have had two dresses made by her and they are very pretty. I ordered them with no stones and did the stones myself. I find that the dresses are well sewn. I had my husband measure me following the directions on the web site. If you order a custom dress you can choose color and styles. She also has skirts. It is a good way to get a nice dance wardrobe for not too much money.
When you go to the comp there will be dress vendors there. The dresses are very beautiful and very expensive. You can look at and try on some of the dresses to find what styles work for your body.
I hope some of this info helps you and best wishes at your first comp!