You could call in at the Amoury in the Pedder Building in Central. Walk down to the Star Ferry terminal. Ferry across to TST. In the big shopping centre sort fo to the left of the wharf (Habour Terminal Centre?) you will find the Muji store - worth a look. Not far from here is the very modest arcade which houses Lee Baron and Zees. If you walk a few blocks up Nathan Rd, away from the water, there is a small shopping centre on the right with a very big Uniqlo store on the top floor (and a few other interesting shops as well).
Have a great trip.