Newly introduced 9 slot leather pants and jackets with 12 slot leather vest and Sposn backpack only gives 7 quickbar slots.
When comparing to the same backpack, assault vest (8 slots), Gorka pants (6 slots) and Gorka jacket (6 slots) you get 10 quickbar slots.
I think when leather pants and jacket got upgrade (from 2x2 to 3x3) you didn't update their value how many quickbar slots those clothes give.