Possible Clues:

• Habitués
• Surreal novel about one thousand frequent visitors to The Bar
• Patrons that might order 'the usual'
• Some men's jacket sizes
• Soldiers the landlord knows well?
• Little resistance with awfully large US soldiers
• Frequent customers of the local pub
• Uniforms known to barmen
• Good customers
• They keep asking the same barman for drink in school uniform for primary