I bought size medium, which should be 32-34 from their sight. I typically wear 33" waist trousers. One of the pairs was uncomfortably tight, but had enough material so that I was able to let it out a bit more than an inch (I look for any opportunity to use one of my vintage sewing machines). I found that they ease a bit with wearing so perhaps a half-inch would have been sufficient. The second pair was tight, but I was able to fix by relocating the buttons for the fly (yep, no zipper on these) gaining about a half inch. Both pairs were marked as Italian size 48 which should be equivalent to US 32.

Hope this helps.