Possible Clues:

• Soldiers behave like troopers in jacket and tie?
• Oats from Western Samoa for boxers, for instance
• Correct answer by setter suits, perhaps?
• Cryptic answer by the setter in trousers, etc
• Male garments
• Blokes curse boxers et al
• Sew name originally on right shirt or trousers, say?
• Traditional focus of Brooks Brothers
• Suits, briefs, etc
• Valets possibly curse, seeing such clothing