Tony Pulis watched Albion score 7-0 as they beat non-league Gateshead to reach the fourth round of the FA Cup.
Saido Berahino stole the show with four goals after a sluggish start from the Baggies.
But Victor Anichebe, Chris Brunt and James Morrison found the net after Pulis made his way pitch side after initially watching from the stands.
"I had no intention of going down - I did so after about 15 minutes. We started apprehensively and they shouldn't be like that, but they have been," said Pulis.
"That's got to be eradicated. We need confidence and belief. Winning games is vital for confidence. I tried to stay upstairs and analyse it but I just get too involved.
"I won't be wearing a suit next week - I'll be back in my tracksuit."
He added: "Until the first goal went in they played ever so well so credit to them.
"But we got a couple of goals before half-time. We looked a little bit more relaxed after that.
"I'm pleased we scored a few and kept a clean sheet. But next week we will really get to work and the nitty gritty.
"The real work starts on Monday.
"We have a difficult job on our hands. A lot of clubs are fighting for survival.
"This will be a big window for us. We need to strengthen the team and the squad."