I am currently finishing some summer dresses for one daughter using a very simple style. I try to find a good cotton fabric that will hold up to an active 11-year-old's lifestyle. I have made a pattern that is very simple using 4 pieces. It is quick to layout and cut and easy to sew. I measure the skirt length and cut 2 of those the width of the fabric. Then I fold the rest in half lengthwise and place the front, back and sleeve on it and I save the scraps to make a bias for the neck. I sew everything by machine except for the buttons. I haven't figured how long it takes as I haven't sat down to time the process from laying it out to sewing it up.