Hooooooly cow everyone! Thanks so much for the response! I'm so flattered!
I actually wore it today (with jeans, because I'm lazy and I didn't feel like doing the ol' shavey-shave) and I got several compliments; people were totally shocked when I told them I made it, especially out of our ugly college t-shirts.
I haven't washed it yet, so I don't know how it'll hold up
For those of you looking to make your own, just follow this tutorial:http://www.craftster.org/forum/index.php?topic=177288.0
For the sleeves, I just made long skinny triangle shapes, attaching the pointy side to the front and the base to the back. You might have to use extra fabric from another shirt to make them long/wide enough.
Also, I added a waistband under the bust (to hide my crappy stitching!), but that's pretty easy and self-explanatory.
It helps if you use a blank t-shirt so that you have more material to work with (I didn't, regretfully).
It took me a long time, most of that was trying to figure out how to fix my stupid mistakes, but once you get the hang of it, it's pretty basic.
Above all, if things don't work, just improvise!