Thrifting Rule No. 2: Size does not matter.
Not "size" in terms of fit but rather, "size" in terms of labeling at the store.
I found this made in U.S. blazer in the medium section where it clearly should have been marked a small (36s). Don't be afraid to glance at the sections that are too large or too small for you because you just might find a hidden gem marked in the incorrect size.
Blazer: Artcraft $4.00
Shirt: J.Crew Factory
Pocket Square: The Hill-Side
Tie: Lauren by Ralph Lauren
Glasses: Warby Parker