Skirt guards, also known as dress or coat guards, are useful to have on a transportation bicycle. They protect your clothing from getting caught in the spokes and protect you from a resulting wreck. Velouria at Lovely Bicycle! sums up the merits of skirt guards well, and her post is a good read if you are unsure if skirt guards are for you.
In addition to a sewing machine, you'll need:
The materials list is a general guide. I choose the denim because I wanted the skirt guards to match a bag I'd already made. These aren't meant to be all weather, but they will hold up better if you use a heavy material for the inner pieces. If you wanted to make them more durable, you could use waxed canvas or a heavy, waterproof cotton duck.
Press your pieces and fuse the interfacing to the outer piece per the interfacing's instructions. If you want to add a pocket, sew it onto the outer piece before fusing with the interfacing.
Pin the inner piece to the outer piece.
Use your machine to sew the pieces together. Use the same color thread in your bobbin.
Pink the edges being careful not to clip any stitches. Use a small pair of scissors to clean up the hole for the wheel lock.
Using your bike, mark where the grommets will be placed.
Using the directions that came with the grommet kit, install grommets at the points of attachment. Almost done!
Using ribbon, string, or twine, attach the skirt guards to your bike. Be sure to double knot and cut any long hanging ribbon. Finished!
If you give this project a try, please post photos at the Madison Bike Life Facebook page - I'd love to see what you come up with.