When I look myself up in a sizing table (such as 'size XL means 42 inches chest,') is the table showing the size of the garment, or the size of my measurement?

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I wear US size XL sleeves. What is the equivalent size in Asian measurement? - Quora

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My chest size is 48 inches. - What size shirt should I wear? - Quora

I wear US size XL sleeves. What is the equivalent size in Asian measurement? - Quora

My Chest is 32 inch. Which size of Tshirt & Polo Tshirt and also Shirt should I wear? - Quora

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