I've seen several changes in the Navy enlisted uniform over the years. I wore the "CPO-style" uniform when I first enlisted in '77. Back then dungarees consisted of a medium blue shirt and dark blue trousers. The buttons were larger than you saw on the "Seafarer" uniform (chambray shirt and bell bottom jeans). The pockets were sewn on the outside. Seafarers were an optional uniform and not part of issue.
I didn't think they looked very "Navy" then. The seafarers, while not perfect, were a great working uniform. The old dungarees were tougher though. I knew one second class who had a set where the threads holding the pockets on had deteriorated and he had then re-sewn on and kept a good working uniform. They were comfortable and durable.
Onboard ship, I would tear pants pretty regularly on piping flanges or lagging cover straps as I moved through the spaces. (I'm a Machinst's Mate.) One time, during casualty training, I jumped to the third rung of a ladder from the deck at a full run and I split my seafarer pants from the crotch to my knee. That was a fabric tear and not a seam tear. I was in-spec fitness-wise. I grew up on a farm and I'm a big guy. Safety-wise, I guess it's good to be able to have something that will rip off if it gets caught in machinery.
My point is that no matter what uniform is chosen, it is going to get soiled, oiled, greased, ripped, torn, and beat on.
I don't like the idea of E1-E6 wearing khaki. That just seems wrong. Leave that for the chiefs and O-gangers.
I was still in when the current working uniform was issued. I felt like I was joining the Air Force. Collar devices seem out-of-place for an enlisted working uniform as well. It's just something else to have to keep track of when you should be focused on your job.
BDU-style has its place. We all know it can be an impressive uniform when worn right. If we went to that style, I would want to see BDU trousers and an appropriate T-shirt when someone is doing maintenance or standing watch in a hot area (like an engine room or digging into a hydraulic system out on a hot tarmac). But, with the military bearing of some officers, I could see men and women wearing the BDU top as well by command requirement. So you ruin shirt and trousers instead of just the trousers when your shipmate loses control of that grease gun!! I have to admit, I would have torn BDU-pants a lot more often in an engineroom that I did seafarer pants.
One uniform we used to have that was very popular was the summer white shirt, and black trousers. It was more comfortable than summer whites, and you didn't have the problem of staining you have with the summer white trousers. But they did require dry cleaning.
I agree with everyone here that the uniform styles shown so far don't seem to fit. There has to be a way to find a uniform that is uniquely "Navy", that is durable, comfortable, and looks good regardless of a person's body shape.
Why don't we have a contest where members of the fleet can submit ideas and sketches? Then have the best submittals go through this kind of acceptance testing.
