One of the main things you will get from this is the clothier-exclusive recipes. It's mostly more refined clothing, like for exampled tailored gambeson armour (i.e. gambeson with less drawbacks due to being better fitted, I like to use it as my everyday protection since it doesn't slow you down) or reindeer herder clothes (very warm, great for the winter). The sewing kit, which is very good for fixing up your old clothes, is also normally clothier-exclusive i believe.
Other than that you can craft some minor things from other classes like the Blackguard short sword, or the Malefactor's sling. Disabling class-based crafting restrictions also disables the little note in your handbook that actually lets you know a given recipe is exclusive, so it's a bit hard to tell which ones are newly available. I believe the Clockmaker's tuning spear still requires you to be a Clockmaker for it to actually function however, so keep that in mind. It's more of a display piece for other classes.