This has just been identified as Parnara kawazoei, quite a common 'skip' in Luzon:
There are many Ypthimas, which I thought were all the same. I posted one pic on the Singapore site, and it turned out to be Ypthima stellera:
which I gather is comparatively unusual.
Below is the more usual type that I see. I'll try and get a positive ID and post.
ps: Apparently, the last pic is also stellera, but a male. This is the dominant species on Luzon, so not really special at all

Tony M.