No that Western denim shirt was uniquely slim. We'd recommend going up 1 size for a "normal" fit and 2 sizes if you're going for a very relaxed/oversized fit. One thing to note (paging @jet ) is that they're reasonably short.
I thought that was the navy nailhead flannel that @Murlsquirl bought, but looking closely, now I'm not 100% sure. It does look worsted and the chest pocket looks too straight for Formosa (unless that's the angle)