You will need:
A old jersey shirt or fabric
Paper and Pen
Overlocker or Sewing machine with zigzag stitch
A pair of baby trousers to use as a template (I have included my pattern for 0-3m which you can download for free here).
Start by washing an ironing your old shirt, we don't want the pants to include any sweaty pits, or left over baked beans do we.
Take a pair of trousers that you already own for your little monkey and fold them in half. Lay the half on top of a piece of paper and draw around the outside but stop where the waistband and ankle sections are as we need to make separate pieces for these. you will need to add seam allowance to all sides except the outside leg which you will cut on the fold so no seam is required here.
Do the same thing again for the waistband and ankle sections. You will then need to double the height of these pieces as they will be folded in half. For the waist section add a seam allowance to all sides once you have doubled it. For the ankle sections add a seam allowance to the top, bottom and right sides but not the left, you will cut the left piece on the fold.
Cut your t-shirt open along the seam lines so you have a flat section of fabric. Cut 2 leg sections on the fold, 2 ankle bands on the fold and then cut 2 waistbands. The waistband is not cut on the fold because I found that a t-shirt did not have enough fabric left to enable you to do this. Instead cut two and we will join at both sides.
Open up the two leg pieces and with right sides together. Pin the outer top sections only and sew these together. I used an overlocker for neat edges but you can do this just as easily on a regular sewing machine, just make sure to use a zigzag stitch to allow for some stretch when you pull these on and off your baby.
Open up the leg sections again and lay right sides together with the two seams on top of each other in the centre, they should now look like a pair of trousers. Pin the inside leg sections and sew a continuous line from the bottom of one leg to the bottom of the other.
Now you are going to make the waist and ankle sections. With right sides together place the two waistband sections together and pin at either end, sew the two ends together. For the ankle sections, with the fabric still folded as cut sew the open edge together as you did with the waistband.
Now fold all these sections in half hight wise with the wrong sides together so the join seams are on the inside and press.
With the leg sections still right side together place the waistband section inside the top of the leg section with the raw edge at the top and pin all the way around. Sew round this top raw edge making sure you have placed your side seams sensibly and be careful not to get the bottom of the band stuck in the machine. I placed my seams at the sides, but you can line them up with the seams on the leg sections if you prefer.
Using the same technique as for the waistband do the same for the ankle sections.
Now you can turn you pants the right side out and press.
And your done :) These awesome little pants only take about 30 minutes if not less once you have the hang of them. Your little ones will have a new wardrobe in no time!