West Ham United surged to a rapturous win against Chelsea in the League Cup – probably their best performance at the converted Olympic Stadium.

The Irons took an early lead through a goal from a Cheikhou Kouyate header in the 11th minute, before a fine 18-yard strike from Edmilson Fernandes proved to be enough to see them through – despite a late consolation for Chelsea through Gary Cahill.

Cheikhou Kouyate (floor) celebrated with teammates after putting West Ham an early lead (Nick Potts/PA)

West Ham have had a poor start to the season, while Chelsea are only a point off the top of the Premier League – so what’s changed?

Well, the Chelsea manager has.

Chelsea manager Conte’s appearance was a little out of character (Mike Egerton/EMPICS Sport and Nick Potts/PA)

That’s right, Antonio Conte ditched his usual dapper suit for a blue hoodie.

7 changes, along with Conte in sweats and a hoodie, definitely experimental. I expected way too much from this game.

— Lady of Bear Island (@sujeeeen) October 26, 2016

And it's kicked off at #Chelsea West Ham, don't even know what to suggest how they can stop the agg. #Conte in a hoodie though biggest news

— MG (@Zlatan_79) October 26, 2016

Perhaps his outfit was the reason his players seemed a bit more casual against West Ham?

@ChelseaFC I wish Conte had taken this game more seriously. In a hoody – weaker team, bringing Terry back for this?? shocking decisions

— #NoDAPL adm (@toallthings) October 26, 2016

Conte's wearing a hoodie??!! That must be a sign of the impending apocalypse??!!

— CFC Science (@CFCScience) October 26, 2016

A logical conclusion.

Looking at the pictures maybe Conte regretted the decision at least.

Just look at him looking longingly at his counterpart Slaven Bilic’s fine suit and knitwear.

Perhaps it was the West Ham manager’s shirt and jacket which made the difference? (Alastair Grant/AP)

Chelsea striker Diego Costa couldn’t even look at his manager’s outfit as he left the field.

Costa may just have been disappointed with his failure to get on the scoresheet (John Walton/EMPICS Sport)

At the end, Conte and Bilic shared a word – and we know what they were saying.

“You couldn’t have leant me something could you?” (John Walton/EMPICS Sport)

Well, the team may not have clicked for you Antonio, but actually the jumper actually went down rather well with most.

All about Conte in a hoody! #casualwednesday #eastlondon #WHUCHE

— Greg Hill (@gregbillhill) October 26, 2016

Big fan of Conte's hoody, only positive to come out of today's game, really.

— Roro (@RomanC_17) October 26, 2016

Conte's hoodie 😍😍😍

— Jessica (@Jessicaalrubay1) October 26, 2016