Did a commenter suggest he was thinking he was getting by with one suit? I hope I read that wrong. If so, I want to know what firm he is at this summer because I will send some Lysol. You certainly don't want to be known as the "smelly" summer associate. No, you cannot wear the same suit every day. In particular, what if something spills on it, and remember, it is summer and most places will be warm. You need time to get that suit cleaned periodically so you need other to wear and you don't want people to remember that you were the guy who only had one suit.
Further, let's talk about tailoring and cleaning for one moment. You know I mentioned tailoring before. Very important. Spend the money to get the fit right - hem, etc. Remember, you gotta spend some money to make some money. I usually do not notice suits unless they are particularly ill fitting or particularly sharp looking. In the middle is fine.
Cleaning - find a good dry cleaner nearby and get your shirts (men) laundered and pressed there (and for those women's tops that need cleaning send them in too). Remember, it is hot in most places, you may be nervous (sweating), you don't want to take off your jacket in the office and be wandering around with those lovely yellow armpit stains. Not professional. Men's shirts are very inexpensive to have done and most places have same day service if you bring them in early. Spend the money. Look, when I was a summer I really had no money in the bank. But I still took what I had (or perhaps I just charged some) and got myself some new suits, shirts, shoes. You want to feel comfortable, feel and look good, and give a professional (and not distracting appearance). I didn't want to spend too much time on this subject but since we had some questions, I thought I should address it.
Oh, and finally, once you get started, look around at the attorneys and see how they dress, they will usually be good guides as to what would be appropriate and how you may be able to use things you have. My friend Jennifer often wears skirts with nice twinsets in lieu of a suit. She says many of the women in her firm do this to mix things up and then it still looks professional, adding some nice jewelry etc. Not to be too "fashion show" here, but just a suggestion to keep your eyes open for how the office culture seems to indicate the dressing goes.
Hope that helps. BTW, I was out walking to a lunch meeting today and I saw a young boy (maybe 9?) going out to lunch for "take your child to work day." Dad was in a suit. Boy had a suit and tie on as well, and carried a briefcase. He did look very cute. Everyone smiled. But the point is, even the little boy dressed the part for going to the office. And he's not even being paid or seeking employment. If Johnny can do it, you can too.
Have a good Friday.