Bought my second shirt at the Haneda Airport store where they stock the US cuts. Great service as they have specially produced models you can try on - over your shirt as they don't have fitting rooms, but you get a good idea. 6-8 of the shirts in each size on a separate shelf from the Japanese sized ones. Great experience
I'm sure any cream you find in NZ will he fine - I dont think you need any fancy creams - many people don't use anything at all. Lots of brushing with any cream conditioner would be the way I'd go, and a horse hair brush is great.