The website "My Own Tuxedo" has a chart on how to measure and general information.

http://www.myowntuxedo.com/detail.aspx?ID=673 and look for the link "Help with sizing?"

They say regular is 5ft 8in to 5ft 11in and sleeve length of 33-34in and long in 5ft 11in to 6ft 2in and sleeve length of 35-36in.