The colo[u]rs I wear are not important, as long as I don't wear any pink clothes.

as 在这里是连词，表示"当...的时候"或"因为"的意思。 long 的本义是"长的"，在这里与 as 搭配形成固定短语。 as long as 是一个固定搭配的短语连词，意思是"只要"，表示条件关系。