EXHIBIT 99.3

KPMG LLP 600 de Maisonneuve Blvd. West Suite 1500 Tour KPMG Montréal, Québec H3A 0A3 Telephone (514) 840-2100 Fax (514) 840-2187 Internet www.kpmg.ca

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Gildan Activewear Inc.

We consent to the use of:

• our Report of Independent Registered Public Accounting Firm dated February 20, 2019 on the consolidated financial statements which comprise the consolidated statements of financial position as of December 30, 2018 and December 31, 2017, the consolidated statements of earnings and comprehensive income, changes in equity and cash flows for the years ended December 30, 2018 and December 31, 2017, and the related notes (collectively, the consolidated financial statements); and

• our Report of Independent Registered Public Accounting Firm dated February 20, 2019 on the Company’s internal control over financial reporting as at December 30, 2018;

each of which appears in the Annual Report on Form 40-F of Gildan Activewear Inc. for the fiscal year ended December 30, 2018.

We also consent to the incorporation by reference of such reports in the Registration Statement (No. 333-208022) on Form S-8 of Gildan Activewear Inc.

February 22, 2019

Montréal, Canada

*CPA auditor, CA, public accountancy permit No. A110592

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(“KPMG International”), a Swiss entity. KPMG Canada provides services to KPMG LLP.