i've got to dissent here

. I buy 100% cotton. They breathe. poly/cotton cleans easier, comes out of the dryer looking good, is cheaper, but its hot!
Cotton, i run through the cycle and shake out almost dry. presentation coats i will starch and press. They also go to the dry cleaners every couple of months for a cleaning.
The best way to go though is to use your linen service for uniforms. Cleaned and pressed and ready to roll. Of course this depends on uniform budget. A place that will not outfit their staff is usually not worth working for IMO.
hth, danny