What suit does the assistant wear in the AT&T commercial with Mariah Carey?

I’m looking to know what brand – or more specifically – the exact suit that the assistant character wears in the new AT&T commercial. It ends with Mariah Carey blowing a kiss at the assistant, and then a shot of him kicking the elevator while on the phone.

Further, any information regarding how to buy a suit that fits like that would be helpful.