How do I dress up as Renesmee Cullen?

Me and my friends are mive twilight fans and when we heard that our school is doing a 'dress up as your favorite book character' event for world book day, we jumped at the chance. My friend is going to be bella(as a vamp) and i am going to be nessie. The only problem is that we don't know what to wear. I figured curly hair and pale skin, maybe some fake blood but im stuck on the clothes. I do own a twilight t-shirt and also a edward one. The edward would be ridiculous obviously but maybe the twilight one would be good as it is ironic? Please help! also i cannot buy a t-shirt as i lack any allowance lol. Answers please ! XD