I think Erskine May just says "Members should dress in business-like attire" - so maybe if he had a special 'business bin' as opposed to a 'smart-casual bin' he

I think Erskine May just says "Members should dress in business-like attire" - so maybe if he had a special 'business bin' as opposed to a 'smart-casual bin' he could argue the point. He would though have to remove the bin for votes at the least