Yes, Etsy is for sales, but many creators offer a "Freebie" section to build their email lists. Search for "Blue is the Warmest Colour SVG." An SVG (Scalable Vector Graphic) is a cut file for iron-on vinyl or direct-to-garment printing. If you have a printer and transfer paper (costing less than $5), you have successfully acquired your "free top." Pinterest is also a goldmine; use the search string: "Blue is the Warmest Colour" free PNG shirt design.
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While the keyword demands "free," there is a philosophical debate within the community. Blue is the Warmest Colour is notoriously anti-capitalist in its artistic spirit, yet the act of wearing the shirt is a tribute.
If you cannot find a legitimate free source, consider the "Thrift Flip" which is ethically free:
Congratulations: You have created the ultimate "I Blue is the Warmest Colour Free Top" for zero marginal cost.