Express Delivery will probably use DHL. They're excellent and will handle all customs stuff. But they will also add their own fees.
But everything goes through customs and they WILL charge you all the costs as indicated by @Jehosefat
You'll pay double at least of the cost of the shirt.
Standard is completed this side by Post Office...you'll never see your stuff.
I have similar sentiments regarding the post office and wanted to opt for the express regardless.
Just now worried about the customs fees etc.
thank you for your help