First, I like my pockets about 5" x 5" (unless I use the cutout from the armhole)
I always make my pockets 2 layers
I sometimes vary my shape (but keep the 5" width)
Fold over 1/4" of fabric at top
There are several things I like to use to accent the pocket.
One of my favorites is a vintage hankie
Take 1/4 of a hankie... cutting it the same width as the fabric
but about 1/2" above the top of the fabric
Fold over the hankie at 1/2"
Place hankie on the fabric so you have a finished edge at the top
If you are using lace as an accent cut it a little longer than the fabric and place on top
If you are using rick rack cut it longer than the fabric and place on top
Place you second piece of fabric on top with right sides together and pin
Sew together the sides and bottom leaving the top open
Clip corners and cut extra lace or rick rack off
Turn the pocket right side out... using a pointer to push out corners and iron
Here is my favorite tool for doing this
If you have fabric showing at the top just push it into the opening
Stitch across the top making sure that you catch the folded over fabric inside
and then add any accents
I often add my label to the pocket
Buttons make an adorable accent!
Just make sure you located them so that you can sew the pocket onto the dress
When sewing the pocket onto the dress be sure and backstitch at the beginning and the end!!