It is hard to judge the colour tone of the underside when worn.
The spots are quite yellow & suggest at once Caltoris cormasa.

C. cormasa; Underside more rusty red brown ;spots yellower.
http://4.bp.blogspot.com/-ET0KyvY9PP...0/DSC_0341.JPG
http://1.bp.blogspot.com/-HYiGh0gEIE...0/DSC_0126.JPG
http://4.bp.blogspot.com/-b-kBsIeG7M...altoris-sp.jpg

C. bromus; Underside more ochreous brown ; spots paler ie more whitish.
http://photobucket.com/gallery/user/...MS5wbmc=/?ref=
http://img0.ph.126.net/pAg5pZhYqA8Xo...8117714504.jpg

TL Seow: Cheers.