Social class is very related to skin color, at least in Bali. Balinese cover themselves up extensively to avoid getting any darker, cosmetic products are specifically advertised as having bleaching properties to make you whiter, etc – all because historically darker skin was associated with the lower/lowest caste (peasants) and lighter with the upper.
Most cultures in East/South/Southeast Asia have a similar reaction to skin colour for the dominant local ethnicity. For example, when in Tamil Nadu, (sadly) local people with darker skin are considered lower class. (Positive note: This is less and less true when you talk to young, highly-educated Indians!) As a counterpoint, of course, this would not matter if a group of wealthy South Indian-descent Malaysians walked into a business/shop/restaurant in Kuala Lumpur, Malaysia. (For less knowledgeable readers: South Indian-descent Malaysians are a comparative minority in Malaysia -- Wiki says only 6.6%!)
This is strictly personal, but where I grew up with mostly light skinned people... showing up after winter holidays with a dark tan made you look so hot and so rich! Did anyone else feel the same? It carries into my life as an adult. :)
