The two massive department stores in Taikoo are Jusco (recently changed to AEON) and APITA, you will be able to find great varieties of imported Japanese products here; household product, supermarkets, frequent japanese food festival of different regions. They also have big section of Imported Japanese clothing including a line – ELPLUS for PLUS SIZE WOMEN, located on the 2nd floor of the department store (which recently been cancelled, only some LL size left, which is around size 12 baggy clothing options).
I would say this section has started to appear around 3-4years ago perhaps to cater the more mature population. A recent visit to Apita, I found the new line from them which I am ecstatic about. Although the place itself is not very attractive, but if you look through the clothes piece by piece, you will find something that nowhere else in Hong Kong offers for plus size women. Below are a few of my picks and the sizes are 1x, 2X and 3X ( around UK size 16,18 and 20).