simple use edit mode here are the steps
1 start mount and blade warband 9 go to the chest in Jelkala
2 configure 10 place the armour u want in the chest
3 advanced -> enable edit mode
4 make the game windowed
5 go to Jelkala
6 press CTRL E and a edit menu will pop up sorry but i dont know how to put a weapon in the chest
7 go to items i made a question about that
8 look for all the stuff u want