Where do I find the style number of a product?

Clothes:

The style number of a product is located on a small, white, paper-like label located under the wash and care labels.
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The style number is preceded by the label STYLE or the season initials FW## or SS##
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Shoes:

The model number (or SKU) of a shoe can be found on a label located on the inside of the shoe tongue.
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For UA shoes, the SKU is labeled as an ART NO. and is located just under the size bar. Please note the ART NO. includes a 7-digit Style Number followed by a 3-digit Color Code. (Ex: ART NO. 1215467-103)
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RN stands for :registered identification number." It is a number assigned by the FTC to US businesses that manufacture, import, distribute, or sell products covered by the textile, wool, and fur Acts. Companies can use this number on product labels instead of the company name.

A CA Identification Number, commonly known as "CA Number", is a five-digit number preceded by the letters CA issued by the Competition Bureau. Only Canadian manufacturers that process or end textile fiber product or Canadians engaged in the business of importing or selling any textile fiber product are allowed to register for a CA Identification Number.