there's a thread about the HKG tailors in the Women Travelers forum:
http://flyertalk.com/forum/showthread.php?t=373210

I've been researching myself as my wife and I are heading over to Hong Kong soon. Here's what I've found so far:
Jantzen does do women's suits, they have a picture of one on their web site http://www.jantzentailor.com/

WW Chan has a women's "section" called Irene Fashions:
http://www.wwchan.com/clothing.html

I came across this tailor, Margarent Court @ http://www.margaret-court.com.hk/
through this page.

Pacific Custom Tailor also appears to do ladies clothes:
http://www.pacifictailor.com.hk/ladies.htm

Custom made/Made to Measure shoes are also available. There is one called Zee's at:
18 far east mansion arcade
g/f middle road
Tsim Sha Tsui, Kownloon
Another shoe maker is Mayer Shoes at the Mandarin Oriental Hotel. And one more, Dophen, at the Mirador Mansion in Tsim Sha Tsui.