Marks and Spencer, official tailors to the England team, declared last Saturday #NationalWaistcoatDay in honour of Southgate and his team.
Museum bosses said the waistcoats were helping to bring the three-piece suit back into fashion.
"Southgate's, now iconic, waistcoats, have helped bring the three-piece suit back into fashion -- a trend that was started in 1666 by none other than King Charles II, who was spotted in London by (famous diarist) Samuel Pepys in what is now known as the first waistcoat."
Beatrice Behlen, Museum of London senior fashion curator, praised Southgate for reviving the fashion of wearing waistcoats.
"Waistcoats were born in London in 1666, promoted by King Charles II," she said. "The new fashion soon spread and for at least 300 years a three-piece suit formed a key part of every man's wardrobe.
"Now Watford-born Gareth Southgate is reviving that London tradition and bringing waistcoats home to the forefront of fashion.
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