How to go Guangzhou (wholesale market clothing ) from HK (causeway bay) ?

From where you are, you can take the Island Line to reach Wan Chai Station and then walk to the No. 17 - 21, Fenwick Street where you can find the direct buses for Guangzhou.
You need to take the buses for Guangzhou Hotel. After that you can walk to Haizhu Square where you can take the local subway line 2 to Railway Station. Get out of the station, you can find many markets selling clothes in wholesale and the Baima Market is there.