1) Draft a pattern using a pair of your favourite pants, this will give a better result than a bought pattern, as you already know they fit well and are comfy! Try not to stretch the fabric as you copy them, just mark the important corners and stretch the waist elastic to get the correct width. Use a French curve to give a nice shape to the legs. Add a 1cm seam allowance to the front and back pieces.
Cut bands for the legs and waist. Use the same jersey or a bit of ribbing, as I have here.
legs 1.5" wide, waist 2.5" wide. they need to be about the same or a bit longer than the pattern piece as you'll stretch them as you sew them on.
You need a 2 way stretch jersey for the best results, with good recovery.
5) Roll up the front pants piece and lay it right side down, so that the gusset matches up at the top.
Bring up the lower gusset edge (2) to meet the pants and gusset at the top. You will have 3 layers. Sew all the layers together withe the 2 rolled up pieces in-between everything.
This is called the Burrito method, often used for shirt yokes.
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9) Add the waist bands to the top edge. Work on the right side and place the bands with the folded edge facing down and all the raw edges together. As you sew, really stretch the band (but not he pants pieces) so your pants will stay up! Work with the band on the top to make this easier.
10) Fold upwards and press.
There you go, Pants! Sooo comfy and the best use of scraps of jersey ever. Mix and match your colours for some new pants that make you happy!