The Manila City Hall is quite a popular landmark in Manila as it sits right beside the passageway (Taft Avenue) that traverses all the way to Edsa and bodes well near the Central Station of the LRT 1.
To get to Divisoria, a marketplace known to all due to its dropped prices in bulk commodities like plastic ware, ceramics, fruits, tela, garments, toys, among others, first you need to do is reach Manila City Hall where you can ride a jeepney that has Divisoria written on its signage boards.
You can reach Manila City Hall by any mode of transport - may it be through LRT 1 and arrive either at Carriedo or Central Station, through indirect transport via LRT 2 or MRT then to LRT 1 Central Station, through buses and fx taxis with "PGH/Taft" or "Lawton" signboards, and lastly, through a limitless corolla taxi ride. When you see SM City Manila and/or a high tower with a clock on it, that's the point where you're very sure you're in or near Manila City Hall.
Divisoria resides near Manila City Hall. The Divisoria jeepney will drop you at the plaza near Divisoria. From then on, you'd just have to walk and stroll along the mini-streets of Divisoria. There are a lot of malls/shopping centers there where you could buy a lot for RTW (ready-to-wear) and distributorship. Beware that some "branded" products may be mislabeled and counterfeit.
Hope this quick guide has helped you get to Divisoria.