Possible Clues:

• For example, engrossed by flashing leg in informal dress
• Light dressing gown
• The egg gets into line for undress dress
• Line worn under the egg
• Not the best address, by the sound of it
• Get some gin with glee in an informal way of wear
• Loose gown cut short? Careless!
• Casual attire (from Fr.)
• Recovered from the Nile, egg without proper covering?
• Diaphanous dressing-gown