Waitresses who wear red get up to 26 percent extra in tips than they would wearing other colours, researchers claimed on Friday.

Bigger tips come only from male customers. No matter what colour they wear, female diners will give the same sort of amounts for service every time.

Yet men, whether they realise it or not, give anything between 15 percent and 26 percent more to a waitress in red than they would if it was the same waitress wearing a different colour.

The test was simple. Take 11 waitresses in five restaurants over a six-week period and ask them to wear the same kind of T-shirt every day but alternate the colours. Previous research has suggested that waitresses could earn more if they acted provocatively or wore more make-up than their colleagues.

But this study, by the Journal of Hospitality and Tourism Research, only changed the colour of the T-shirt. Every other aspect from make-up to behaviour remained the same.

When wearing either black, white, green, blue or yellow T-shirts, the size of the tips from both male and female customers was almost identical.

But when they wore red, the size of the gratuities went up from male customers, yet stayed the same from female ones.

About 272 restaurant customers were studied by researchers Nicolas Gueguen and Celine Jacob for the journal of the tourism industry. – Daily Mail