If an order has multiple items on it:

for example, the order have four shirts,the 1st shirt will have the main the shipping cost charge, and the rest of the shirt will get the additional item shipping cost.

If the order is consist of different items, the one that has the highest shipping rate among of them will be charged as the regular shipping cost and the rest of the items will be charged as an additional item shipping cost.

You can check the shipping cost in the app or thru this link:
2019 Updated Price and Shipping sheet

Your also may like to see:
What is the additional cost print?
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