Yes, there are several garments wholesale market in Zhanxi Road and Zhannan Road near Guangzhou Railway Station. I am a fraid it is not available to find branded clothing in whosale price, unless imitations. If you want to see some branded stuff, outlets and factory shop are better choice. At present, I know there is only one big outlets in Wanbo Center Shopping Street. Another two outlets are going to be built within this year and next year. To find some famous sport brands, WANGUO-PLAZA in Haizhu District is has factory shops.