I have been in Hong Kong a few times now. Today I went to Sham Shui Po.
I want to pass on to you as much information as possible so you too can find your way around this crafty haven.
Start by getting the MTR to Sham Shui Po. There are several exits to get out of - C2 or A2 are best.
You might like to start off at the Yen Chow Street Hawkers Bazaar - a great place for fabric. It's a bit of a walk from the station, but worth it. You will find it on the corner of Lai Chi Kok Rd & Yen Chow St - opposite the police station (lovely older style building). You can buy fabric here for personal use.
A lot of the fabric is end of rolls, samples etc. The fabric is sold by the yard (91cm for those of you who live in metric land) and you may have to purchase whatever is left on the roll. I did buy 2 yards of a woolen fabric from a large roll. It just depends on the stall holder and the fabric your wanting. There are also several stall holders selling braids, buttons and trims.
Fabrics available range from linen, cotton, wools, polyester, fake furs, silks, sequence and more!
I was there at about midday on a overcast cool January day. I wouldn't want to be there in the middle of summer. It is outdoors, but has tarps and tin for roofs and walls. It would be stifling in the heat.
It opens at 11am closes at 7pm. Not sure if it's open on weekends.