I intend to buy a 40R unstructured unlined 100% Brisbane Moss 215g cotton jacket and shrink the sleeves and shoulders so it fits me, 38S but sometimes too tight. My plan is motivated by my wish to be able to wash the cotton jacket to remove disco dance sweat anytime. The clothes shop stated it is not responsible and claims Brisbane Moss claims the cotton is preshrunk. My research online about preshrunk cotton shows it can be shrunk. Any advice regarding my procedure of inducing shrinkage, etc.?