Fabrics don't always hang the same so consider this when deciding how to hem your garment. After making a top, skirt or pair of pants, hang the garment on a hanger for at least one day. Trim the garments so the layers are even after hanging.Turn up a 5/8" seam allowance on each fabric and hem them together.
Slippery fabrics drape differently so it's better to hem them separately. Make the side you'll be wearing the most about 1/4" to 1/2" longer than the opposite side. Hem both sides separately with a machine hem or a rolled serged hem.
For an interesting detail, hem one side 2" to 5" shorter than the other and finish the bottom with a rolled hem. One side will have a surprising spot of color showing at the lower edge.
On pants with two fabrics hemmed separately, the longer side will show when you wear the shorter side.To prevent this, sew snaps on each side seam allowance to lift the longer pant when wearing the shorter pant (11).
Single-Layer Reversible Garment
Double-sided fabrics allow you to make a reversible garment from only one fabric. Most double-sided fabrics are woven, but some are printed and look different on each side. To make your own double-sided fabric, print a unique design on one side of a solid fabric with stamps, foil or stencils. Many regular patterns can be used to create reversible garments but you need to think through the construction process before beginning. Here are few things to consider:
Construction: Use flat-felled seams on shoulders, side seams and sleeve caps so the garment looks finished from either side. On heavier non-fraying fabric use a lapped or butted seam.
Neckline: Use binding or facing as a design detail and to finish the neckline. Place piping or fringe under the outer edge of a facing or hem before stitching it to the garment for added interest (12).
Hems and Waist Elastic Casing: One side of the garment will have the opposite side's color showing when the hems or waist elastic casings are turned. If you want only one color showing on each side, add facings to the hems and waist to create a casing, and then hem the turn-under allowance.