First, pick a pair of jeans, the less stretch the better, and get your mom to take pictures of you in them. Jokes, sort of.
Second, pick your length. Mark where you would like them to hit and add about two inches to cuff them. Go for the longer Ralph Lauren mom shorts, or even Jessica Simpson's daisy duke. (If you choose the second, don't forget to not eat for the next four months.) Now, mark them and begin amputation.
After chopping off the legs, pin up the cuffs. Two inches is a good cuff length in my opinion. After pinning, find the seams on both inside and out. You need to stitch (by hand or machine) along the original seams. After making sturdy cuffs, iron them down to prevent premature unraveling.
And wahhhhlaaaaa. You have a new pair of summa' time shorts. Now, go tan. xx
deep apologies for the tiny pictures. blame photobucket for effing up my post.