Possible Clues:

• Change into home gear first to get disguised
• Mix gin and tonic love, secretly
• Isn't it common to seize pawn, nothing disguised?
• Tossed coin and got in unknown
• Possibly noticing nothing as disguised person appears?
• Noticing changes, getting round in disguise
• Somehow noticing love cannot be recognised!
• Unidentified gin and tonic drunk - nothing added
• No icing to be removed whilst in disguise
• It was as Silas Tompkin Comberbache that Coleridge remained so