I wear the goggles under the helmet because the clip on the back of my helmet fell off and I lost it. I actually went to a shop and they ordered me a new one. I am still wearing the goggles under the helmet. I like it that way.
I normally don't even wear a helmet. A nasty out of no were fall, almost like I was pushed over caused me to start wearing one again.
I have a Bern helmet and those tend to be the type people wear over goggles. Bern helmets are more simple and lack all the crap around the ears. Wearing my helmet over the goggles works will with the model of helmet I have.
IT AINT EAZY BEIN STEEZY