At Microsoft's consulting divisions, customer visits are a part of the job. A shorthand has developed to describe how formally dressed you should be at the meeting with the customer.
- Suited and booted: Business suit including necktie.
- Business casual: Collared shirt and trousers (no jeans).
- Microsoft casual: Jeans and a t-shirt.
(I leave it as an exercise to develop the comparable attire for women.)
Note: This Microspeak entry was submitted by a colleague from the UK, so it may be peculiar to the UK dialect of Microspeak.