I'd wanted a good glen check suit for some time, and this one had a nice scale to it. Large enough to be prominent, small enough to appear as pale grey flannel from a distance of ten feet. I like glen checks best with an overcheck. In the old days I was certain only red would do, but blue is much more understated and workable. Brings the possibility of navy ties into the picture, despite the general black and with nature of the suit.
A suit like this is what I might call an "extra suit" in that it should really only find its place in a man's wardrobe well after he's acquired suits in navy, charcoal, and perhaps the same with some sort of stripes. For someone like me who never really needs so mach as a tie, let alone a suit, it could be better called an unnecessary frivolity. But so be it. Oddly, in its way it's more useful to me than a navy or grey suit. Given its more casual connotations, it reads less like a business suit and as such feels more comfortable when worn for its own sake. Besides, dare I say it, it actually works as well as (gasp) two separate pieces as it does a suit. I wouldn't give such grotesquely incorrect advice lightly, so please allow me to explain.
For starters, we can see that the suit works quite well in its complete form. It is well constructed with a soft three button stance, darted front, moderate shoulders and side vents, with forward pleated trousers. This gives it just the level of formality that a suit should have.Sharp enough to be worn "in town" (as though that mattered anymore) but not so stiff as to be bound only for business meetings. In this photo, the camera is set about ten feet back, and the glen check pattern so obvious in the first photo is muted from this distance. True, the right sleeve could be a whiff longer, but let's not pick nits.
The trousers work just as well on their own with a vintage varsity cardigan in a big cut with shawl collar. A navy or black jacket would go just as well for a slightly dressier look, while a heavy black turtleneck sweater would be more casual. True, these trousers are half a suit, but glen check trousers are frequently seen alone as a single garment in their own right. As a side note, for men who actually work in businesses that require suits this look works quite well in the privacy on the office. Wear the suit on the commute, with clients, and at board meetings, keep the cardigan in the office for greater comfort while working behind closed doors.
No problem wearing a solo glen check jacket either, especially with dark grey flannels, aka "the pants that go with everything". Like the trousers, glen check jackets exist alone too, and a light grey jacket is something unexpected these days, though still quite correct. Even my nemesis agrees. A younger man could wear this jacket quite well with dark jeans and a crisp shirt, sans tie. Navy pants, never a favorite of mine, would work too. Just don't pair it with black pants. In fact, unless you're in a tux, don't wear black pants...ever.
This approach doesn't work for most suits, as the separate pieces will always look like just that, pieces separate from their counterparts. Stripes are the most glaring example, but I find a separate navy or charcoal jacket just as orphaned looking. Glen checks, being more about pattern and texture, get a pass, if you're careful and you can pull it off. Go halfsies with a suit like this, and you might get three outfits in one.