You probably arrived to this post through: http://answers.yahoo.com/question/index?qid=20080909231905AAyB83i
In which case, I welcome you and give you some bonus pictures (and advice). Here are some pics of me in various homecomings and proms from 2000 and 2001. Please note that the vests on me only occurred because I got the tuxedo for free because I was voted onto the homecoming court.
I highly recommend you RENT and not BUY a suit especially if you’re in high school (unless you can buy a cheap suit for cheaper than renting!). Make sure the suit is tailored with whatever option you go! Even a cheap suit will look great if it’s tailored well.
Your body will change in college, and you don’t want to spend big money on a suit that may not fit you later! Lots of people gain weight in college! I happened to own one suit but that was because I was in band.
On a tight budget, I recommend you do an event that’s FUN and don’t worry about the limousine and all the other frills. Eat some place your group will enjoy. Don’t worry about the most expensive place. You want the night to be about FUN with your friends, and not necessarily over “protocol” or what’s “traditionally” done. And if you’re like me, the fun can be ruined if you’re worried about how much money you’re spending.
In regards to looking your best, get the suit or tuxedo tailored to avoid the “boxy” look. Check out this article for further details on the “tailored” look.