British Transport Police are hoping to reunite the owner of the items after the wrong suit bag was picked up from the train.
The owner of the bag, Ian Domingo, had been visiting London to take part in the 100th anniversary of the Gallipoli campaign in which his grandfather died.
While there he was given a pin badge to commemorate his grandfather’s service, which was attached to the suit in the bag that was taken.
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Mr Domingo said: “I had travelled down to London for the commemorations in remembrance of my grandfather who served with the King’s Own Scottish Borders Regiment.
“He was killed in action on June 4 1915 at Gallipoli. The blazer had various badges attached which will be almost impossible to replace as part of the legacy to my grandson.”
Officers have carried out extensive enquiries, checking lost property at various stations in the hope that the passenger had realised his error and handed in the bag, but have so far been unable to locate it.
Investigating officer PC Gez Cooper said: “The person who has picked up Mr Domingo’s bag is likely to have just hung it back in the wardrobe, without checking the contents and won’t realise their mistake until they need to wear the items again.
“I would appeal to anyone reading this who travelled on the same service and took home a suitbag, to check the contents – hopefully we can reunite Mr Domingo with his suits and pin badge and return the dresses and other items to their rightful owner.”
The bag, which contained tartan trousers, a blazer and another suit along with the pin badges, was mistakenly picked up by a passenger, who was accompanied by a woman, when he left the 12.30pm Virgin service from Euston at Lancaster at around 2.55pm on Tuesday, November 10.
If you can help reunite the items with their rightful owners or have any information please call 0800 40 50 40 or text 61016 quoting reference PSUB/B13 of 22/01/2016.