The grey pinstripe suit is a stalwart of a business man's wardrobe, second in importance only to navy blue. I come across a fair amount of such suits in my travels, usually in heavier fabrics for Fall and Winter. I even have such a suit myself. Finding a version in a lightweight worsted for Spring and Summer is a real treat.
Hertling in New York in the late 1960s.
Given the fact that I really don't need to wear a suit, ever, and this is such a business uniform, I find that the big unlined rolling collar of a vintage Brooks Brothers shirt ($5.49) and a silk knit tie knock the seriousness of this one just enough to make it comfortable for walking around town.Sacrilege to some, but so too in a way is wearing a suit to a job wear others wear jeans. It's all about middle ground.
It might not be easy, but if you find a nice lightweight striped suit, pick it up. It makes a refreshing alternative to all the khaki and tan worsted that is the order of the day this time of year. Get striped for Spring.