Step 1: Sew the top edge of the collar with 1/4" seam
allowance (or whatever seam allowance the pattern indicates).
Open the collar flat, with the seam allowances facing up, press
the seam allowance toward the under collar and edgestitch through
all layers (sketch 1a).
Step 2: Fold the collar with right sides together, the sew
the ends (sketch 2a). Clip the corners and turn right sides out.
The top collar should automatically
roll over the edge of the under collar (sketch 2b).
Note: This technique works beautifully
on a curved collar. It also very useful on center front plackets,
armholes, facings and cuffs.
Congratulations, you just learned
another new sewing technique!