Yes, SKIRTINGS is a Scrabble word!

Letter values in Scrabble US: S 1, K 5, I 1, R 1, T 1, I 1, N 1, G 2, S 1.

Is it a valid word?

SKIRTINGS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)
pass around or about; move along the border
form the edge of
extend on all sides of simultaneously; encircle

Also: put off.