I am not the originator of this pattern and do not know who is. I was asked to look at one made like this and copy it for a gift.
If you know the originator of the pattern then let me know and I will post it here. Just want to share with you how I made mine to give as gifts. I do not use a gauge per se. I used measurements for the 3 panels that I crocheted. The pictures are shown as we go, and I will explain each step. :0)

This shows the finished product both closed in picture one, and open in picture two, to show the layered pockets!

Step 1: Step 1: Make Your 3 Panels

Materials:
1 ball 3 oz. of Sugar and Cream cotton yarn camouflage in color
large eye needle for yarn ( to sew up sides )
7" zipper beige in color
beige embroidery thread to sew zipper
sewing needle right size for embroidery thread (3 strands)
7/8" or 1" button depending on how loose your button hole is.
need to fit snug

I used a crochet hook size H and the stitch I used was half double crochet.
For my way of crocheting 2 rows equaled 1/2 inch.

make 3 panels.
I crocheted the largest panel #1 to be 11½"high X 7½"wide
the second panel #2 is 7½"high X 7½"wide
the third panel is #3 is 3" high X 7½"wide

If you need help with basic stitches, here is a website that I utilize CrochetSpot.com

Panel #1
chain 32, make a half double crochet (hdc) in 3rd chain from hook and in each chain to the end. (30 stitches) chain 2 turn
row 2. hdc in each stitch across to end, (30 stitches) chain 2 turn.
Continue row 2 until you have 33 rows. now you will make the button hole with rows
34 and 35.
row 34: hdc in the first 13 stitches, chain 4, skip next 4 stitches, hdc in the 17th stitch and the remaining stitches to the end. chain 2 turn.
Row 35: hdc in each stitch to the chain and work 4 hdc in the space made by the chain 4 and continue hdc across to the end. chain 2 turn.
final row 36: hdc in each stitch across to end. Finish off.

Panel #2
Follow directions as for Panel #1 up to row 23 and then finish off.

Panel #3
Follow directions as for Panel #1 up to row 10 then finish off.

Step 2: Making the Zipper 'change' Pocket

making your zipper change pocket:
Fold panel #2 as shown in picture and using embroidery thread (3 strands) in large eye needle...sew the zipper as shown to the top edges in order to make a pocket.
Be sure to tuck in the zipper ends and sew them to sides of pocket to prevent them from sticking out of the top of the pocket.
At this point you may also choose to use yarn to sew up the sides of this panel before attaching it to the center of Panel #1.

Step 3: Align the Panels Before You Attach the Zipper Pocket to Panel #1

First test align your panels before sewing!! The pockets are made by layering the panels.
Test to see if when you fold the bottom up and the top down it will allow for the button hole to be at the desired place on outside of bottom flap when folded up.

Now you will layer and secure the panels together as shown:

Place zippered panel #2 to the center of panel #1 as seen in picture and secure by sewing with yarn the bottom of panel #2 to the panel #1.

Proceed to step 4 ......

Step 4: Finish Assembling the Layers, Add Button

Click on the 3 pictures here in this step to see as you go

Place panel #3 on top of panel #2 and secure by sewing with yarn the bottom of panel #3 to the front of Panel #2.

Fold up the bottom part of panel #1 to almost cover panel #3
Make a few stitches up the center of both panels #2 and #3 together
in order to form your 2 smaller front pockets

Sewing the sides together of purse:
Use yarn to start at bottom of each side. Line up the edges of each panel and loosely ( not too tight ) sew with a whip stitch the side edges together from bottom to the top edge where zipper panel ends. finish off and weave in the loose ends.

Fold down the top flap of Panel #1 to see where you need to place your button in order for it to line up with the button hole. Sew button on front of purse.
Fold down flap and button up!
Done!