When my younger sister was really little- maybe three years old or so- she had a most amusing way of sitting down when wearing a dress.
First, she would hold the corners of her dress, as though about to perform a curtsy:
Then, she would lift up the bottom half of the dress entirely, exposing her tushy to the world:
And finally, she would sit down, bum fully in contact with the seat:
This whole motion was carried out smoothly, and without a trace of self-consciousness.
Now that it's quite hot out, I find myself wearing skirts often, and whenever I am about to sit down, I remember my little sister and giggle to myself.