In thrift shopping, the most basic clothing items are often the most elusive. Odd as it may seem, you're often more likely the find unusual things than stalwart basics. With men's clothing, the basic items still get worn, and as such tend not to survive until the time comes to donate them. I have written on this topic before, and in my experience no garment has been harder to come by than a standard grey suit.
The classic grey suit had been so hard to find, in fact, that a few years ago when offered the chance to try custom through Imparali Tailors in New York, I immediately had one done up in charcoal grey in a year round weight wool. The suit has some minor points in the details that aren't entirely right, due mostly to my own miscommunication with the tailor, but in general I've been happy with that suit.
Then, in the past few months, the flood gates opened, and three other standard grey suits of excellent quality managed to find their way to me, each through a thrift channel of one kind or another. On the left we have the most recent acquisition, a mid grey tic weave in lightweight worsted with a ticket pocket and forward pleated trousers by Polo, from the heyday of USA production, had for $34.99 via ebay. In the center, a slightly heavier suit with a nailhead weave, also with forward pleats, by Paul Stuart, another ebay find, this one was $40. On the end, a heavy but soft flannel from the Andover Shop, gotten through trade with someone who bought it at a thrift shop. And that's not to mention the two suits I have in grey pinstripe, one for Summer and one for Winter.
Patience really is a virtue, especially so in thrift shopping. If you can only bide your time, every famine will be rewarded with a feast....eventually.