Possible Clues:

• Trousers
• Trousers have one out of breath
• Not, in short, so wearing as to have one out of breath
• Out of breath, they go down to legends
• How very wearing for a daddy long legs out of breath!
• Man may be in them but out of breath
• Fittingly, the obscene phone caller wore...
• Deep breathing is so wearing
• Not short of breath?
• They would never be short enough to make one short of breath