2+2 skort

I am going to turn the 2+2 skirt into a skort. My girls don't care for the super short tight bike shorts that you can buy to wear under skirts. They ride up and they find that annoying. I have the badminton pattern. I am planning to use the shorts from the skort. Does anyone know if I need to extend the top of the short pattern a bit. I know the badminton has a wide waistband. I am also eliminating the placket of the 2+2 skirt. I think that will make it easier to make it a skort. Thanks in advance for any advice!