Start by defining the vibe you want to wear, then match the fit, color, and print to that style. Decide between official Billie Eilish merchandise or fan tees, and consider whether you prefer a unisex or a women's cut. Check fabric type and care, since cotton and blends feel different and wash differently. Finally, verify your usual size against a simple size chart and read reviews for fit guidance.

Fabric choice and print durability determine comfort and longevity. Look for cotton or cotton blends for softness and breathability, and consider the fabric weight to gauge sturdiness. For prints, verify the method used supports durability, with crisp graphics and resistant colors, especially after washing. Also check care instructions to keep the print looking good over time.

Decide the primary purpose: everyday wear prioritizes comfort and easy maintenance, while a collector or gift aims for official licensing and lasting detail. For daily use, choose soft fabric and a comfortable, forgiving fit. For gifts or collections, look for official licensed designs and prints that stay true to the artwork over time.

Turn the shirt inside out and wash in cold water with a mild detergent. Avoid high heat in the dryer; air dry or tumble dry on low. Do not iron directly on the print; if needed, iron inside out on a low setting. Following these steps helps preserve color and fabric feel longer.

Compare your measurements to the online size chart and, if possible, measure a similarly fitting tee you own. Look for notes on whether the cut is unisex or tailored for women and read reviews about actual fit. Consider sleeve length and shirt length to match your preferred look and layering needs.

Check for official branding and licensing marks from the artist or label and buy from authorized retailers. Look for clear product descriptions mentioning licensed artwork and avoid listings with vague or dubious claims. Official merchandise typically offers better print quality and consistent branding.