Just recently J Crew added a Q&A for the men's section entitled "Jack Knows Best." Men can send in questions they can't ask anywhere else about appropriate clothing 'n such! Great Idea!
Send your man to the J Crew men's section for the rest of the invaluable info!
Some sample question:
How long should my pants be?
Where can I wear a linen suit?
When do I wear a crew-neck sweater versus a V-neck?