*Note: Linden Mesh Skirts are an actual piece of clothing on the skirt layer.
Prim Skirts are an object (the little box symbol in your inventory) usually worn with some sort of under shorts.
The "omg my butt is huge" skirt problem or Mesh Skirts:
Left side is normal look and right side is modified
There's a simple fix or workaround for this one, but you need a shape that you can modify. Make sure you're wearing a mesh skirt as well.
1. Right click on yourself and select "appearance".
2. Choose the "Shape" tab then the "Legs" button.
3. Scroll down a little bit and you will see where you can change your butt size and saddle bags.
4. Make your butt size and saddle bags smaller (I make mine 0).
5. SAVE AS... Use the save as button, or else you will overwrite your original shape. Save this shape as something like "Skirt Shape".
See the difference in the following two pics...
Left side is before modify:
So there you go. I do hope this helps.
Thanks so much to