Marks and Spencer, official tailors to the England team, declared last Saturday #NationalWaistcoatDay in honour of Southgate and his team.
"If Southgate wins the World Cup he 100% deserves a knighthood", Ross Patrick, the man behind the idea, told the Press Association.
"The style of play has changed and so have attitudes". Our country has been through some hard moments recently in terms of unity but sport has the power to unite - and football in particular has the power to do that.
"We want people to celebrate and enjoy themselves, but not at the expense of law-abiding fans and emergency services' resources". "Croatia don't have the sort of attacking players who can really make something out of nothing, so Luka Modric and Ivan Rakitic will be relied upon to engineer opportunities and we need to limit their time on the ball".
"You can feel the encouragement and support. It's a very special feeling, it's a privilege for us".
Although Wembley was the home of English football long before 1990, back then England's home matches happened under the twin towers, rather than the arch.
But Southgate revealed he could not listen to it for many years.
And they've revealed that since the showpiece began, sales of waistcoats have doubled due to people wanting to channel their inner Southgate.More news: Israel strikes Syria at Golan frontier
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Croatia coach Zlatko Dalic believes victory over England would spark a huge party in the country.
The British Beer and Pub Association predicts more than four million extra litres will be served during the match, delivering a boost to the national economy of up to £30 million (RM160 million).
"Those emotions are what drive us, that is our petrol and how we have come back to a semi-final after 20 years".
"I think it's good the players understand it's a big moment for the country".
"I've met quite a few of those players and we know exactly how they're held and perhaps in the modern era that would be even crazier, social media and everything else, the global thing is so much bigger".
"Growing up and watching England, to be a part of it with the lads...it is an fantastic achievement form everyone here and we can't wait to get going against Croatia".
"They're getting blamed for what my generation and generations that followed did".