This post is for Heidi, or anyone else interested in the technique. This is what I was taught was a french hem. But I have never read a sewing book so if I'm calling it the wrong name, feel free to correct me.
Okay, first you start with your two fabrics pinned together with the right side facing out:
Next you sew them with a 1/4" seam allowance. On my machine it's the width of my machine foot. (If you are using a knit, you always want to slightly stretch the fabric while sewing so the stitches won't break as you pull it over your head or wear it.)
Then trim the seam to approximately 1/8":
Now press. As a general rule of thumb, I always press seams toward the back:
Here's the inside after pressing:
Now pin again with your pins parallel to the seam. (Sorry for washing these photos out with my flash.)
Sew. I usually do just a tiny bit more then 1/4" here. Most patterns include 5/8" seam allowances, so this will make it exactly that amount.
And press again. I am big on pressing. That makes a difference between something that looks professionally made and something that looks home-made.
Here's the end result:
It takes a little more time but is great to do if you don't own a serger and like neat insides. Keep in mind you need a thin fabric to pull this off. I use it on jersey knits, shirting, shears, etc. I think denims work well also.