The Ladies' Box Pleat Riding Skirt pattern from Modest Handmaidens was very easy to make. I made two for my daughter who goes horseback riding with her husband. There is also a child's version at the same site. www.modesthandmaidens.com/catalog.html?item=545
Another pattern I bought from them was the surplice apron. Where the surplice crosses in the front I created a pocket for my cell phone. Again, a very easy pattern to sew up. www.modesthandmaidens.com/catalog.html?item=1219