Alteration: My new favorite way to keep original hem on jeans
How to hem your jeans and keep the original hem! It will work with flares. The only difference is that you need to do a small reinforced stitch to resize the hem to the width of the pants where you'll hem. Sofie Love has a blog that demonstrates this.
How to tailor your jeans.... Great idea!Did this. It's so easy and it really works! If you have boot leg, don't take too much in at the bottom. Also used a serger to cut and sew at same time. Super quick!
Pro Alterations: How to Shorten Jeans With the Original Hem
Now remove the first (lower) line of pins, then fold the jeans outward so the original hem edge meets your second (upper) line of pins. Pin this fabric in place evenly all the way around. Make sure the seams align at the sides. Take the jeans to your sewing machine and stitch right next to the original hem. It helps to fit the tube of the jean legs over the "free arm" of your sewing machine, if you have one, so the fabric lays flat.