Pro Tip for noobs like me - you can have different transmogs on the same armor for different specs!

I just found out, after complaining in guild chat that I couldn't do this, that there is a drop down menu next to the apply button on the transmog menu. You can switch between "Apply to all specs" and "Apply to current spec." This way, the same armor pieces can be given different appearances that change based on your current spec.Feel free to downvote if this is common knowledge but I was excited to find out.