This fabric wallet was super easy to make, it only took about 2 hours to make. It ended up being a little bigger that i had first planned but turned out great!
It is 8" by 4"

Step 1: Gather Supplies

Well, first of all you need to gather supplies, for this project you will need:
-small scraps of different fabrics (including 1 about 1o'' by 10" square scrap)
-7 inch zipper
-button (mine was about 1 1/2")
-tiny piece of quilt batting or felt/thick cloth
-elastic hair tie (thin ones works better)
-clear plastic (I used a zip lock bag)
-thin cardboard (Kleenex box worked great!)
-color coordinated thread
-fusible interfacing (i don't know if it really does anything...but i put it on)
-sewing machine
-scissors
-ruler
-cutting mat and rotary cutter(you can use scissors, but a rotary cutter is easier)
-iron

Step 2: Cover

First of all we make the front cover. To start out find 6 fabric scraps that you like, ( you will want to iron them if they are wrinkly) and cut one 1 1/2 " by 4 " rectangle from each scrap. Figure out how you want them laid out, and then sew them together (1/8 mark on sewing machine) to form a long wallet shape. for the other side cut 10 2"by 2" squares. And cut a 1"by10" strip. sew the squares into 2 strips. Then sew the thin strip between the two square strips. Then iron them. Now find the fusible interfacing and cut a piece for each wallet cover half. Follow the instructions on the interfacing package.

Step 3: Button

Now you will want to sew on the button. grab your button, and thread a needle. Cut your batting/felt so it is just a tiny square to go on the back of the wallet to keep it more secure. Make sure the button is in the middle...then sew it on! Next you can sew the front and back cover together

Step 4: Zipper Pocket

Now you will start on the zipper pocket for the inside. First of all, find the 3 fabrics, one for the main pocket part(A), one for the small top(B) of the pocket, and one for the inside(C). Cut piece A - 3" by 8" and B- 1" by 8". Find your 7" zipper. Next, put the zipper foot on your sewing machine...then sew the zipper onto the fabric (it is easier to sew when the zipper is unzipped) Next cut a pice out of cloth C that is the same size as the zipper piece. Once that is done, position them so that when you open the pocket you will see the GOOD side of the bottom fabric(C). Now sew around all 4 sides, you will be able to turn it inside out by the zipper opening. Now turn it inside out and iron it!

Step 5: The Card Pockets

Find a fabric that you like. Measure it to 3 times the size of the zipper pouch(long way) Then fold it accordion style so that it has 2 rows of slots for cards. make sure it is even, then iron it very well. Now you will want to get the plastic (zip-lock bag) and cut it to a rectangle, you can trim it later so for now just the rough shape is fine. Fold the piece so that only the part you want to have the window on is on cutting mat. Using rotary cutter to cut whatever size or shape of window you want! (My window was about 1 1/2" by 2 1/3") So put the plastic between the fold of fabric (so you can't get to the edges of the plastic) Then sew around it with zig-zag stitch. I went twice around for extra strength. Then measure to find the halfway mark of the fabric and sew down the middle to divide into sections. Next get out the iron and iron down all the edges over just a tiny bit. (you are going to be sewing on the top so you don't want to have the edges showing) BE CAREFUL NOT TO IRON THE PLASTIC! IT WILL MELT! Also, on the very top, fold it over and sew along that edge (opposed to just ironing) because this side will not be sewed down later. (I did this later when i made the real thing, so it is not done in the pictures...)

Step 6: Put It All Together

You are almost done! Cut a piece of fabric that is the same size as the front section that you already sewed. Fold it in half and iron the fold very well. Place the zipper pocket and card holder onto it as centered as possible. Pin them in place and sew around 3 edges of each. Leaving the long side that is facing the middle OPEN. I sewed on the 1/8 mark on the sewing machine. Befor you do anyhting else, figure out where you need to put the hair elastic so it is in the right spot to reach the button, put a mark on the bad side so later you can know here to sew it. Now place the cover piece and the inside piece good sides together. (one side might be bigger, but that's ok, you can just sew over it) start by sewing one of the long sides (once you get to the place you need to put the hair elastic, then just stick part of it under and sew over it a bunch of times, until you feel like it is secure) sew ONLY 3 SIDES! leave open one of the shorter sides! Then sew down the middle, on the crease line, this will help it fold better.

Step 7: The Last Step!

Now cut the cardboard into 2 rectangles, that are a little smaller than half of the wallet. slip them into the wallet. Next turn it right-side-out and iron the open end over so they are equal and you can sew it easier. then sew that last edge closed! I went over it twice to be sure it wouldn't come open. Enjoy your homemade treasure at last!