This is Sara from J. Jill. Thank you for your question!
Our Perfect Pencil Skirt is not lined, but the cotton fabric offers great coverage, even in the lighter colors. We do not recommend ordering a size larger than your usual size in this skirt; it is fitting true to size.
We appreciate that you have taken the time to share your thoughts regarding adding some sizing hints to our size guide. We will be sure to that your suggestions are communicated to our team!