Possible Clues:

• Front-of-the-rack sizes, often
• Start to search shopping centres for underwear
• Drawers available in southern retail areas
• "You're killing me, __!"
• Rapper Biggie ___
• Underwear found in shopping area aboard ship
• Underwear safely stored at first outside precinct
• Underwear found in shops aboard ship
• Drawers maybe start to scribble a couple of lines in writing
• Rap legend Biggie