It's a Mandarin collar (or a "stand collar") shirt, paired with a sequined scarf tied as an ascot.
Re: NORE's post above about it being a wing collar pressed flat (and pending correction of my guess from someone not simply guessing!) I'd actually surmise that wing collars themselves arose due to the older military stand collar being pressed down at the front for more comfort when turning round (remember, in the military, stand collars were often very heavily starched - and sometimes used in conjunction with a stock - to encourage holding one's head up straight).
You also see this collar style on jackets (sometimes called Nehru collars for the self-explanatory association).
Edited by Holdfast - 9/27/12 at 9:05am