"with bells on" was first used in the Royal Navy and is in referance to a sailors bell bottom torusers. The uniform that included these trousers was their dress gear and was only worn when on liberty or various ceremonies like colours or sunset. It was also popular to wear this uniform to events such as weddings or funerals as it was proberbly the best clothing they possessed.
So to say u will be somewhere "with bells on" is to say u will be in your best dress and in a military fashion.
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