Hey Lauren, hmmm.... I may not be the person to give advice here since when I was planning my year abroad here I packed the night before my flight
As you have probably read on this board, MANY visitors (long and short term) have spent many a day in the clothing stores here and loved it.
I think you will probably end up buying a lot of clothes here, especially if you want to belnd in with the Spanish gals and their stylin "ropa" (clothing) so I would not go nuts on the clothes.
Also, if you need to bring books (lots), ship them over via the loooong boat (3-6 weeks to arrive) about 3 weeks before you leave so they will be here soon after you. You will get a cheap book rate at the U.S. Postal Service. See the
SHIPPING STUFF THREAD for more by
CLICKING HERE. It is on shipping from Spain to the U.S. but it works the same way for U.S. to Spain.
Also, leave bulky stuff at home, especially that which you can get here pretty cheap. A perfect example would be a hair dryer (unless it is a small travel one that can handle world voltage, it will fry here unless you use a voltage adapter), which will take up a chunk of one of your suitcases.
Saludos & hope I helped,
jer...