Yes, in fact I am picking up a jacket today that I had shortened by 2". You just want to make sure the balance isn't thrown off, some say you should have at least 9-10" from your pocket mouth to the bottom hem. Its not exactly a cheap alteration but its doable.
If you go toward the end of that thread a helpful user reinstated the pictures back into the original post.
2 inches is a huge difference
can you post before and after pictures?