3 tribes out of 49

Out of the 49 ethnic tribes living in Laos , I can identify three of them by the clothes they wear. Only if they are women.
The Aka women wear a sin(a sarong like thing) with a blouse on top; what differentiates them is a piece of cloth on their heal folded back and the inevitable basket that hangs from their crown at their back.
The Lantein women wear a uniform black top and black skirt and black leggings with silver necklaces. Very socialistic their can be no class distinction among them.
The Hmong women are the most elaborately dressed with silver beads/plates on their head dress and very nicely embroidered Sins.
I just went into a chinese supermarket. What a range of chinese goos! but no smile or warmth in those who run the shop. This is a common find in all establishments that the Chinese have:be it a restaurant or a guest house or a hotel: no smile; no hospitality; no warmth. Being used to the Lao smile and warmth and hospitality and openness , this characteritic of the neighbour stands out.