Less is Best!!
I have traveled myself with way too much and regretted it! I ended up throwing clothes out so I did not have to carry them around.
You should pack the following: (along with a few extras of course)
One warm jumper/ jacket (for night time)
One pair of jeans (jeans are heavy and you will only need one pair-if that)
One good outfit (maybe for after camp or nights out at camp)
A few singlets, shorts and t-shirts (what you will live in at camp)
Also remember that your clothes will become pretty warn out after camp so don't pack your favs! Keep in mind that you may also want to buy new clothes after camp so be sure to leave room for that (be sure to visit Abercrombie and Fitch - that was my favorite)
Hope this helps.