I think the loadout that I've recently settled on is fairly unorthodox.
On my back I bring an L42 with a stock and a B8 scope because fuck worrying about FF.
A machete in the armor slot. If I find an axe or an alien sword it gets switched out for the machete.
Belt full of ammo. Armor and webbing have ammo too.
Medical pouch with four syringes in it.
Large general pouch which starts with bandages and ointment in it but ends up being filled with whatever I managed to loot. Usually a roller bed, fire extinguisher, or both.
A helmet labelled ("Brain Bucket") and stuffed full of burritos.
Medium armor labelled ("MAXIMUM UNGA"). I'm not set on this phrase though. I might change it soon.
Throwing knife in my boot.
I support, guard flanks, and secure kills on xenos that hit crit just off screen (which happens more often than you might think). If there's a full on battle I'm in the second rank shooting through allies in order to maximize the burst DPS on anything that sticks it's nose out.