Friends:

Immaculately Clean Pure Bright White!

All Lay Buddhist do on suitable occasions, such as on the observance days,
wear an All White Dress to flag their stand, show their purity and unite in an
well ordered, yet open, directly visible and sweetly uniformed social harmony….

It is a quite good lesson in Awareness = Sati to keep this fragile white dress
spotlessly clean! On has to be continuously on the watch-out for any pollution. 
It is associated with a very nice special worthy feeling of being Completely Pure!

Links on and to Mental Purification (Visuddhi)
http://What-Buddha-Said.net/drops/IV/Mental_Purity.htm
http://What-Buddha-Said.net/drops/IV/Ability_Purification.htm
http://What-Buddha-Said.net/drops/II/The_7_Purifications.htm
http://What-Buddha-Said.net/drops/V/Immaculate_Integrity.htm
http://What-Buddha-Said.net/library/DPPN/wtb/u_v/visuddhi.htm
http://What-Buddha-Said.net/drops/V/The_8_Understandings.htm
http://What-Buddha-Said.net/drops/Levels_of_Leaving_Behind.htm
http://What-Buddha-Said.net/drops/II/The_purpose_of_purification.htm
http://What-Buddha-Said.net/drops/IV/The_7_stages_of_Purification.htm

The famous Visuddhimagga: The Path of Purification:
Complete Manual translated by Ñanamoli Thera. By Bhadantacariya Buddhaghosa:
http://what-buddha-said.net/library/pdfs/PathofPurification2011.pdf

White-Clothed Purity ...