Gareth Southgate, 47, is quickly becoming a fashion icon, with waistcoat sales around the country soaring in recent days.
His pitch-side uniform is now iconic, a navy waistcoat, blue shirt and striped tie.
Even Marks & Spencer, the official suit provider for the England team, has reported a 35 per cent increase in waistcoat sales.
Today has even been coined at “Waistcoat Wednesday”, calling on fans to wear a waistcoat to pay homage to the 47-year-old.
Ahead of the World Cup semi final this afternoon, the first England have played in since 1990, a London brand has offered Gareth a lifetime supply of waistcoats if England win the match and make it to the final.
The cult brand Sir Plus is based on Portobello Road and offers waistcoats that retail for around £145.
Brand founder Harry Hales said: “I’m so impressed with Southgate’s performance, and with his choice of attire.
“If we make it through to the finals, the waistcoats are on us. Hopefully we’ll be seeing him in our Portobello Road store very soon.”
England play Croatia in the World Cup semi final later today, and have a 59 per cent change of making it to the World Cup final.
According to data from 21st club, England are now the favourites to win the tournament, slightly ahead of France (52 per cent) and their opponent’s today Croatia (41 per cent).
Speaking to CNN, Mark Powell, a bespoke tailor in London, praised the England manager for his new stylish and practical look.
He said: “You see them (coaches) at the side of the pitch usually sweating with a suit on or wearing a shirt with the sleeves rolled up.
“But with the waistcoat and the tie it still makes him (Southgate) look very elegant. It’s worked really well for Gareth because, at the game, he doesn’t have to wear his jacket.”
Wearing a waistcoat also comes with a few simple rules.
If double breasted all the buttons need to be done up, whereas the bottom button needs to be left undone is wearing as single-breasted design.
If England make it to Sunday’s game, Gareth will never have to buy a waistcoat again in his life, having a surplus supply of Sir Plus garments.
The brand Sir Plus has long been a champion of the now popular-as-ever waistcoat, also using eco-friendly fabrics to make its clothing.
Henry added: “We started making waistcoats from surplus pieces of wool that were too small for tailors to make into jackets.
“Over the years our aesthetic has evolved and become more casual – but our single and double breasted waistcoats have always remained some of our best-sellers.
“Many of our customers will pick one up to wear over a simple grandad shirt – another speciality of ours – for a more laid-back vibe that still looks smart.”