Mix N Match
I am a faithful Topman and Zara shopper. I'm 5'5", slim or skinny to most, so it is hard to find my size in men's clothing. Topman offers complete suit sets as well as individual pants and blazers in a skinny fit and ultra skinny fit. They also always have an array of colors changing throughout the seasons, so you are bound to see something you like. So for people who like a tailored, skinny fit then Topman is the place to shop. Check them out for a fit guide: Topman.
Zara isn't a bad option either. They have emerged as a strong European brand in the states over the last couple of years. Their suit cut is slimmer and as of lately they have expanded their suit selection. You can find basics, pinstriped, and printed suits. This Fall, they have added a cropped suit to the collection, which is tapered at the ankle. I can see cropped suits being popular this season, especially after a spring and summer of jogger pants. But that's just my opinion.
So get out there and shop guys. Hopefully these two shops work out for you!