In Second Life there are things called permissions or perms. All Curious Seamstress garments are No copy, No modify, Transfer. This was done because I don't wish anyone buying a garment of mine, then changing the textures or design around and claiming I did it. It has happened to me before, which is why the perms are now set as they are on all Curious Seamstress clothing.
How can I make a skirt fit then?
I have resizing scripts in all skirts. It's a simple matter of clicking on the skirt and using the blue menu that will pop up. You can either resize individual prims or the whole skirt at once. I've played with it, it works, I swear!