I was informed by The Perfect White Shirt that there are new stocks for the PinoyMountaineer shirts, particularly Shirt. no. 8 (P350), and the PM Drifit shirts (P400)!
The Perfect White Shirt is available in Robinsons Manila, Alabang Town Center, Glorietta 3, Market! Market!, and Trinoma. Also, PM shirts are available in ROX Philippines (Baguio, The Fort, Cebu, and Pampanga) and Sandugo stores! See the list of branches here.