They are authorized for wear. We had several of them in my last squadron (including the CO) and I've been looking to pick one up (preferably throught the supply system) for awhile. Just never got around to it.
I'd just point out that there probably is a difference between "what people get away with...including leaders" and what is really "authorized for wear". Don't believe the WEPs were EVER made of anything but nylon (e.g., never made in NOMEX)...since they were actually the upper half of an extreme cold-weather outfit. Brown pebble grain roper boots used to be worn too, although they were never authorized either. You get my point. Crud, you can wear a NASCAR jacket in your ready room if you want, but it's not an authorized piece of uniform clothing...or issued as a piece of authorized flight equipment.
The older I got, the more I realized that a big part of my job was enforcing standards and setting the right example. Once I figured that out, getting dressed became a lot easier, choice-wise.
There, I think I've fulfilled today's need for an input from a grizzled old type, which is how I think I got caught up in this thread in the first place. "You young whippersnappers...why, back in MY day, (fill in the blank)."
Don't even get me started on how many patches are "authorized" on the leather flight jacket...
V/R, Spike
Most self-respecting Aviators avoided the coveralls all together. I'm sure you got some flak from the SWO daddies. While on CSG Staff, I wore either my flight suit or long sleeve wash Khakis.....I could not lower myself to wear SWO jammies.....I love my aviator jammies just too much. 
