Conceived, drafted, and sewn by yours truely!!
Since it's a pretty basic alteration from an a-line skirt, I thought I'd try to put together a tutorial while I was at it... (although bright blue does not show the sewing well - good for me, not so good for you!)
Step 1: find or draft a plain a-line skirt to fit you, lengthen/shorten as you wish
Note: the front piece is free to hang how it wants, which means the effective bottom hem circumference is bigger than a regular a-line skirt would be - don't make it too wide at the bottom!
Step 2: cut out one back on the fold, one front on the fold, and two front pieces NOT on the fold (basically cutting the front in half):
Cut out two straight pieces to bind the top and create the ties: 2" wide, one piece long enough to bind the waist of the front of the skirt, one long enough for the whole waist + length of ties (I did 80" for this one).
Step 3: sew all darts
Step 4: sew the cut-in-half front pieces to the back on the side seams, press the side seams TOWARDS THE FRONT.
Step 5: hem the bottoms of both the on-the-fold front piece, and the back-with-wrap piece you just finished
Step 6: using a double-hem (turn a small hem in, then turn again so that all the raw edges are hidden), hem the edges of the two pieces
Step 7: bind the tops
7a: take your strips, fold them in half, press, fold each edge inside and press again (1/2" binding)
7b: for the front piece, tuck 1/2" in on the end of the short binding strip, sew it over the top of the piece until you get close to the end, cut off the binding strip 1/2" past the end, tuck that 1/2" in and finish sewing.
7c: for the back-and-wrap piece, find the center of the long binding strip and match it to the center of the back waist. Pin the binding along the top in either direction. Once the binding is off the skirt waist it becomes the ties - simply tuck in the end to cover the raw edges, sew the binding to itself for the tie, and keep going along the skirt waist the same way as you did for the front, continue along for the second tie and tuck in the final end as you come to it. Make sure your side seams are still lying towards the front.
8: add buttons to the inside of the back-and-wrap piece, attaching them to the side seam allowances (note that I did french seams here, it really is the wrong side
9: add buttonholes to the sides of the front piece to match the buttons - this is how the front of the skirt gets held onto the back-and-wrap piece!
10: button up one side, put the skirt on, button up the other side, tie the ties! Voila!
Note that you can end up showing a lot of leg this way - the front panel doesn't play modest
. If you'd like more coverage, add more buttons down the side seam to keep the front attached to the back.