We have a pretty liberal policy as to what up armor accessories one cares to wear in conjunction with the vest. I used to work two sides of the street in terms of teams.
Before retiring from SWAT (much less active) we got issued very good armor and all the accouterments.
Many, including me, removed neck, shoulder and bicep. The neck/shoulder was attached as one unit on my vest like a yoke and is an all or nothing deal. Preferably, I'd leave the shoulder, but it is a pain in the ass to look up and have the collar push my helmet over my eyes. In the older version armor, of the Velcro snap grid flavor, the collar was sewn in so we would tape it down with 100 mph.
I would be inclined to wear bicep armor if it were not attached as an afterthought. The elastic that has been wrapped around the shoulders by the gumby who finished and said "crap, forgot the shoulder hooky looper onto thingys" is junk on every one I've had.
The interior elastic that keeps the armor in place is stupid. Both of these stretch over a year or two and flop around all nimbly pimbly, draggin off my forearm and generally pissing me off.
I mean, if companies that charge $2500 for a piece of basic armor can't come up with some sort of better design, I'm astounded. Ease up on the wicked cool Battlestar holsters and think up a sound way to use and carry these. Lookin at you Armor Holdings. (they may exist, I've never seen nor been issued it...always stupid elastic.)
On the main side of my job, I may sit in a car that is Fiscally and physically getting smaller and smaller annually, for hours upon end, before leaping into action. In the past two years I've gone from my genuinely spacious Tahoe (an LT, not those ragamuffin popo packages you legs are always stopping me in) to a Nissan Maxima, and now a new Impala (again LTZ...I am not an animal)
Now my Italian friends are enamored with the trunk space in these things, but the driver's seat is like warming up for circus de soleil with armor on. Not an issue cruising the Blvd in our tank/bearcat, but problematic with an up armor package.
Guess which side gets more indoor time with front sight post sightings?...the clown car gig. Since leaving the team, it is no longer an issue because I get to serve all the warrants I want without the headaches of that extra stuff because...well we don't get it...no not even plates.
All that to say, I'd wear the bicep gigs if there was even a quarter of the thought that went into laser cut molle or quick release cable things put into hanging those dudes. If there is an I'm not aware, I apologize...but I've still never seen them.
Re groin armor: I've rolled with the up-armored loin cloth off and on for years. The biggest reason is that's where I keeps my med.
I've taken it off several times over the years trying out new delicious areas to keep med kits, but always come back.
My current vest has no option for loin armor so I took an old one, some dude chunked, and I had my favorite tailor sew a good size pocket on it. Now, it has male Velcro, but my vest doesn't. So I have that same tailor sew fluffy side Velcro on that and I have a tear away IFAK that has a lot of medicine in it. Plus, I can see into it while doing all my mediciny(sp) things and I maintain ball armor. I have another IFAK on my belt so this is a plus up gig.
+ for arm armor
- for commercial attachment ideas/designs
+ for bulletproof wedding tackle/anti gutshot gear