for extra creasing I sprayed water over them to dampen them and scruffed them into a plastic bag overnight to set the creases. Et Voila.
I handed the shirts over to the costume director today and she seemed pleased. Personally I am thrilled at the outcome as I like to think of the students/actors wearing these shirts and sniffing in coffee! I just hope they get the message not to wash them and to store them scrunched up in a plaggy bag... as if we could expect anything else from these 16-18 year olds.