What do I wear under tunics and short dresses?

[Maxen]

(Knickers, obv...)
I mean on my bottom half. I won't wear leggings - I've got horrendously skinny legs and I just don't have the right shoes.

Jeans - do they need to be skinny? And what goes on my feet then? Or can I wear my beloved (but possibly out of date style) bootcuts?

Skinny jeans with flats.

Or leggings (I know I know) with well fitted knee high boots. Or possibly ankle boots. If the tunic or short dress is fitted then that will look quite nice.

I wear skinny jeans and either little booties (were called pixie boots when I was young) or converse or knee high boots. Anything really. Or tights and heels? Kate Moss has terribly skinny legs and she gets away with it