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Lower class men in the Renaissance often wore what's called a poet shirt. This is a baggy shirt with large long sleeves, almost always white or off-white. Think of a classic pirate shirt. Look for one made of a natural fabric like cotton or linen.  You can choose a different color if you want. Brown and olive green work well. Instead of a poet shirt, you can opt for a tunic if you wish. These are long-sleeved shirts that go lower than normal shirts. Look for something in a natural color and of a natural material. You might already own some cotton trousers that will work for the garb. If not, look for some in a dark color, dark brown or black. They should be long enough to tuck into boots. Fabric is the most important factor here. They didn't have denim back then, and plain khaki pants won't look right either. Look for a light fabric, preferably cotton or linen, or something that looks like cotton or linen. Alternatively, you can look for pants that come down to just past or just above the knee. If you can sew elastic into the openings to make them resemble bloomers, even better. The vest will make your basic male garb complete, besides the shoes and accessories. The vest should be dark colored like the pants, and simple and plain. A leather vest would be ideal, but you have a lot of freedom with fabrics here, so just look for something that you like the look of. Boots will complete your look, as your trousers should be tucked into them. Look for the most nondescript, basic black or brown leather boots you can find. Something like cowboy boots will not fit in. If you've chosen to wear pants that go to the knee instead, you could wear some leather sandals instead.
Find a shirt. Look for pants. Find a vest. Get some boots.