Possible Clues:

• Commercially produced, not bespoke
• Off-the-peg
• All set for mother to go to Germany for type of dinner
• Not built to order
• 'Sounds as if she's prepared to serve you, but not off the peg (5-4)'
• Made to standard shapes and sizes, say clothes
• Not done to measure money earned
• Instantly available
• Quack remedy Ada got off the shelf
• Created for standard shapes and sizes, say clothes