Hello Pearl,
I guess you should check it out of Humen, Dongguan. It’s 45 mins by bus from Shenzhen Station.
I don’t know where you stay in Hong Kong but it takes 45 mins max by train from Kowloon to Lo Wu (Shenzhen).
U can take bus at the Shenzhen Station direct to Humen, the garment wholesales city, just right at the Humen station.
Most of the shops, they are the sales window of the small factories, so you can deal with them direct in person. Just tell them you need Summer Collection, in case they do not have the merchandising in the shop, request to visit their showroom in their factories, arrange pick you up at your hotel. There are good hotels closed to Humen Wholesales City.
U may also check, Alibaba.com - The world's largest online B2B marketplace. for sourcing the factories before your visiting.
Sorry, I am not familiar of Garment that I can’t help much but I am expert on handbags, Belts and Jewelry.
I suggest you check with alibaba.com and make evaluation of the factories of their capability on English, Product Knowledge, Logistic, and service. If you feel comfortable on any of them, you may consider if they can be your sourcing agent in future, it’s more long term to deal with the factories directly with better cost. U can also ask them to pick you up at Shenzhen Station once U pass the border, so you don’t need to worry about the traffic.
I bet you should source a Logistic Company just in case, so u can give them the list of what you purchase and they can organize all merchandising to send by one shipment.
I’ll PM you my skype, so you can contact me in case you need further information.
Good luck
Jenn

Originally Posted by Pearl360:
Thanks Jenn for your prompt reply. What i'm looking for is summer collection, high-end dress. I knew it's quite difficult to find them at this moment but I need to try. Dongguan and Guangzhou are the next destination that i'm going to visit. I could not speak Chinese so I need someone to arrange the trip for me. Unlucky I could not find one on this trip.
Is Dongguan far away from HK? My friends also mentioned about this garment city. Anyone could recommend me where could i find the factory list. I may start for that point.
Thanks again Jenn,
Pearl