To my knowledge, it should be the footbridge towards the Kwai Fong Est.
There're several shops selling Japanese kids' clothes that are very pretty yet cheap. Especially the one called 'Tin Sun Tsuen'. There are a lot of Japanese imported kids' clothes (although made in China also), shoes, accessories...
I went there on Friday, and bought 4 tees (in which 2 of them are Anpanman tees/tracksuits), 2 pants, 1 pack of 3 socks and 1 pair of shoes, just for $850! At this price I may only buy 2 or 3 (max) clothes at Kingkxx or Chickxxduck jah!