Paisley MP Gavin Newlands received a telling off in Parliament after he turned up to vote wearing shorts and a t-shirt.
The Paisley and Renfreshire North representative - alongside Labour MP for Gateshead Ian Mearns were both rebuked for their dress code when they arrived to cast their vote on the current voting method during the Covid-19 pandemic.
The Commons dress code requires male MPs to wear a suit, although this is not as strict during votes.
Commons Leader Jacob Rees-Mogg has said MPs who cannot attend Parliament for age or medical reasons will be able to question the government remotely but not vote.
Mr Newlands had driven more than 500 miles from Renfrew to London, where he was due to give his views on the proposal to allow MPs to continue to vote remotely during the pandemic.
MPs filed through the Chamber for their first socially distant vote of the Covid-19 crisis, snaking first through a 1km queue in Westminster Hall before entering the Commons to cast their vote.
Defending his choice of attire, Mr Newlands said it was "not normal" for him to dress such a way but none of the current circumstances were "normal".
Mr Newlands branded the voting process proposals by Jacob Rees-Moggs as "crazy".
He said: "I arrived straight at Parliament from driving down from Renfrew to London, and went straight to vote.
"It wasn’t my normal dress for work but then again Parliament isn’t normal right now, with shielding MPs prevented from voting and speaking because of their health, and queues of 45 minutes to vote on whether to continue to queue 45 minutes to vote for the immediate future.
"As it turns out, my vote together with others wasn’t enough to stop Jacob Rees-Mogg’s crazy plans going through with the support of the Government and we face the prospect of hours and hours of valuable time being wasted queueing up.
"I don’t think MPs are paid to do that when we have constituents who need our help.