If I see a suit I happen to like and it has a single vent, it will become ventless in short order.
No vents, or 2 vents for me.
Single vents have always reminded me of Old Man suits and I started wearing suits over 50 years ago.
The jacket is to small, short. If it was the proper size you could close the vent.
So you told the tailor what you wanted and he said "sure I can do it", without trying to fit you properly?
Anyone who knows what they are doing would have talked you out of that look you wanted for your own good.
For an infrequent suit wearer a charcoal solid and a navy solid are all you really need. You can go anywhere at anytime, just add shirts and or ties and you'll always be appropriately dressed.
Now once you have these 2 basics you can add pinstripes in blue and grey.
I would not buy a linen suit for second suit.
I've heard there are 50 shades of grey, after the 4 basics I would focus here.