Wear what works for your game, weather, conditions, clothing (Parka, jacket, rain gear, rain pants), ensure whatever you rock interacts with all you other gear. And finally wear all that stuff you have decided to wear UNDER MATCH Intensity. That is, everything works on your home range under practice conditions, but who is to say you are practicing with the match adrenaline dump?
Case in point: I love mounting my holster (right side is my strong side) on my 5.11 Vtac vest. Works well during the draw at my home range and (non-firing practice) in my basement. Then during an October CQB match (read: rain jacket) with extra clothes on since my summer home club and / or warm basement practice sessions, my strong arm no longer had the mobility to reach higher on the draw with my extra layers on! Surprise!!

I've since mounted my holster lower on the battle belt with a Safariland UBL (universal belt loop hanger thingymajig). So much for my beloved 5.11 VTac vest and my SDS Fighting Load Carrier holster mount.
I learned this the hard way, under match intensity. Another case in point: I was slamming the 5/30 magazine into the AR mag well with more enthusiasm, something I had not expected in practice. So come game day/week, the intensity levels varied. All good learning.
Set up your gear bag/ rucksack/assault pack on the line so that you can add layers or peel of layers in between shooting and safety relays/responsibilities /tasks. With all those considerations, now you can steer closer to a decision to rock a plate carrier or chest rig.
Don't be afraid to try different slings also. Have them in your shooting bag/kit/gear so that you can swap the slings during different skills and drills relays. Find what works for YOU and only you.
More anecdotal stories: I love my SONY Camcorder sling (Camcorder has long stopped working and has been ETrash binned) since it has 360 degree swivels on BOTH ends and it also has another 360 swivel on my stolen-from-my-snowboard-leash buckle that super easy to manipulate especially with wet gloves on (don't be scared to try this). I learned that I love this buckle even with my DaKine mitts-stolen-from-my-son's-national team days....
Then upon suggestions from a brown unit in Petawawa, I tried the Magpul MS3 and I like it, great colour, nice feel, but the Magpul buckle is harder to employ with wet and cold gloves. So I keep that MS3 for summer/spring warm weather matches. ha ha ha ha ha
I keep BOTH slings in my CQB kit bag!
Final case in point:
I love networking with Ganderite...For you newbies, don't be fooled by that funny smile on his face. He's not a DCRA Hall of Famer because of his joviality. He kicks ass when he needs to especially in Match 4 with the 5 pistol shots to the head, reload, 5 more pistol shots to the head time frame. He CAN shoot and shoot very well.
He and I try to modify our gear so that we don't spend lots and lots of money. I don't think he realizes that he inspires me a great deal to try the "cheaper" method/modifications FIRST before heading out to Darren / Farmboy at One Shot Tactical for some HSGI or Blue Force Gear kit.
Ganderite employs some of the minimalist looking rigs, and still manages to KICK my ass!

Good on him!!!
I'm not issued this gear so I can therefore buy what I want/ need/perceived needs. No authority figure here at the matches to remind/tell/convince you to blouse your trousers. (it's an old joke)
Hope this helps the match preparation. Lots and lots of newbies out there learning!
Barney