Easy method to convert old denims into overalls.

First wash and dry the denim. Decide what length you want your overalls to be for example knee length or mid thigh. I made three in three lengths and three patterns.

Put on your denim and mark the length you want your overall to be and fold the denim and cut it like this.

Then turn wrong side out of one cut off denim leg and cut off the bottom seam and side seam.

Then mark and cut front part of the overall using following measurements. You can change these to your preference.  These are with seam allowances. 

Then cut back part as follows. height: 8", upper width:8" and lower width: 15" with seam alowanses.

Then cut two 2”*20” strips for belts.

Take the front part and fold it in half. Then make a 5.5” cut from bottom like this.

Sew the seams around all front, back and strips parts. I used zig zag stitch for strength.

Pin the front part in to denim like following. This is why I made a cut; to use existing button and zipper of the denim. Then sew them down. 

Take the back part and sew two belts to it like following.

Pin the back part to the middle of back of the denim and sew it down.

Now put on the overall take the belts right side up over your shoulders and pin the belts to front. Putting on help to measure length of belts fit in to your body.

Sew belts down to front part or use button in each belt and button holes in front part to finish. then decorate it to your taste. I didn't because i am not in to much decorated cloths. But you can use broaches, flowers, beads, any kind. :) You can fold or seam the ends of denim legs. I prefer them just frayed.

The finished product:

Front:

Back:

The other two I made.