Your basic pattern shape:
The crotch notch is 12" x 3" (with the curvy bit). This should fit almost any body, unless very large or small.
For the rest of the dimensions, you want to figure out how long you want them (full length, capri, etc) and then add an inch or two for the bottom hem.
To figure out how wide, measure you waist and divide that by 4. Then add 3-6 inches to that number to get how wide your pattern piece should be.
(You want to add enough length to wrap it around yourself enough to be discreet plus a hem allowance. Since everyone's waist size is different, it is prudent for me not to give a absolute number. However, I will say that I use my waist measurement/4, and then add 2/3 of that number. If you want to go ahead and figure yours out that way, please do. If you have math aversion, just wing it).
The pattern piece above is only half of one leg. Place pattern piece on folded fabric, the fold being the side with the crotch notch (the top edge in the picture). Cut 2.
Open up both cut piece and place right sides together. Sew along crotch notch.
Open up pants and find the waist because it's all hemming from here on out. I highly recommend marking the two waist pieces and bringing them together often while hemming because it is frighteningly easy to get confused and hem the wrong piece or attach a tie to the leg bottom. Or at least I've done it, so it happens anyway. Use some chalk or do a quick baste on the waist to keep it all in order.
First, hem the side of the legs. Good time for funky embellishments or decorative stitches.
Then the bottom cuffs.
Last fold over and hem the waist. For the ties, I usually use bias tape, mostly because I have a goofy amount of it and I'm a little lazy. But you can use anything - make your own, ribbons, whatever will be strong enough. I suggest it be at least a half inch wide, however, to give the ties a firm hold which won't distort the hang of the pants. Reinforce the seams holding the ties.
Oh, and I know you know, but make sure they are long enough! My husband likes to wrap both ties around to his front (he thinks someone may try to untie him from the back - maybe a repressed childhood trauma?).
I'm fine with the back tie, but there are occasions when you may want to double knot. Too long is better than too short (general life rule).
And that's it! All that's left to do is figure out how to get them on :)
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