Possible Clues:

• Workers with white hats
• Ones at home on the range?
• Johnston, Mooney and O'Brien capable of making bloomers
• 9 makers
• They have a dozen of their own
• Janet and Josephine were two makers of bloomers
• Thirteen shopkeepers practise Buddhism
• This dozen is 13 (5'1)
• Early risers? They need the dough
• Cookie-makers