easy, cheap cosplay ideas for teenage girl?

[chubbybattle758]

My friend invited me to go to a cosplay convention with her, she is sorted out as her mother buys her whatever she wants, but I only get less than 15 dollars *australian* a week. I have long brown hair, my body is sort of average/curvy, I am 14 so no bikinis or anything that is revealing. And I want something that cover me up fairly and I wouldn't wear a skirt unless it looks good on me so pants are good for now. And maybe if the hair is tied up somehow? *my fringe is stupid and doesnt look good when my hair is out*
Please give a link to what the character looks like or a cosplayer :3
Anything is good~

thank youu <3

[Nautilus]

You can see here :

1. http://www.pinterest.com/tab0234/cosplay-ideas/
2. http://www.trendhunter.com/slideshow/cosplay-ideas
3. https://www.facebook.com/1000IncredibleCosplay
4. http://screenrant.com/best-cosplay-comic-con-2013/