Oh, I would never encourage that Dani! But like Merry said, wearing clothes that actually fit will keep you miles above the rest from the get-go. Some well-fitting jeans, knit tops (ideally sleeveless), a stylish bag for all your stuff, and some shoes like the ones Kendra wore, and you'll be right where you need to be.
I re-read my post and I suppose I spoke more harshly than I meant to: definitely don't chuck fashion all together and look like a slob, I just meant you might have to dress down a lot from what you're used to. As long as you look put-together, clean, and well-groomed (which I know you will), you'll look great. You may not be fashionable, but you'll be stylish. Does that make sense?