Very similar to the “Chicken” plate carriers used by US Navy SEALs. These carriers were probably designed to be worn under clothing and appear to follow the same “scalable” design philosophy of the more expansive LV MBAV.
One example of this type of vest was recovered from a British Special Boat Service (SBS) grouping. Many of these were available vey cheaply around August 2021.
From two different vests. The 2013 datd example was used as seen by a rip on the inside caused by an armor plate’s corner.
Body facing side of platebags are mesh material like gym shorts, maybe for ventilation.
Cummerbund is elastic.
Inside of Platebag:
Velcro inside for strap length and cummerbund adjustment.