There is a stall (not shop) selling carters bodies. All are $6 each. You can find Gap, Le Top, Gymboree, Next...etc if you 'look' carefully. Somtimes there are also DKNY and Polo (but styles not so good). Some no-brand polo shirts are also very good. Only about HK$20 each.
But there are also some fake Gap and Next. Anyway, the price is very cheap.