Originally Posted by FlyingMonkey
I was referring to the aforementioned lounge suit. I am well aware of the differences in types of suit, but thank-you for thinking that I might need the benefit of your education. Seriously, you might want to be a bit less patronising here as there are many people who have equal if not more knowledge on these matters.
You do realize that lounge suit incorporates a huge range of things, including very informal tweeds and linens, right? "Lounge suit" incorporates just about every suit worn today except for formalwear, and there are huge variations of formality within that category. And a blazer rivals or exceeds many of them in formality. The term came about to describe what we know as a suit today to distinguish them from morning dress, strollers, or evening attire. You seem to think that it automatically implies a fairly conservative fabric, which isn't true at all. It includes that both that charcoal pinstripe appropriate for an investment bank and the flowy white linen Armani you might see on Miami Vice.
Loathing may not fully understand the cultural context of a blazer here in the US (patch pockets are normal and don't really subtract from the total formality even where they would with a suit, for example), but I don't think you really understand the term you're trying to use in debating him.