I have the BARE 3mm vest w/5mm Hood that I've used with mu BARE 5/4 Velocity and it fits nice, but here is what I learned.....
When I decided to get the vest the LDS did not carry the item in BARE, they had Acona and a few other, the fits were disasters so I didn't buy. I found a BRAE dealer in the next state that had one and it poped on like it was made for me. He also gave me donning and doffing tips.
To don, roll the bottom up sort of like a sweater, start into the sleeves, pop it down over your head then bring it down around your torso.
To doff, Pull the front material forward in front of an arm opening Then put that side's hand into the arm opening, down around your chest and out the bottom. Slip it up off your torso and exite the second arm. Pop it off your head.
The BARE one has skin material in the neck for flexibility but it can be a bit clingy. This goes away once a bit of water finds it's way in. If I have the suit snot out I'll rub some on my neck and that keeps my neck comfy before I go in. My wife also like the Vanilla scent post dive.
It's definitely a great layering garment and well worth the trouble to find one that works for you. Great head protection and it puts the kibosh to the zipper seepage. With suit mentioned above we were OK skindiving for 90 minutes with water in the low 50sF. Your experince at depth will vary.
Pete
PS: My wife got her's from LiquidFit, they add a side zipper that makes it a no brainer.