How to calculate the cost of shirt advertising?

Fabric of advertising shirts+factory work+printing+washing water+channel cost (manual storefront or marketing) Online sales and offline sales only have different channel interests. Gift, and then customize a unique birthday T-shirt for him (her)! Related: wedding gifts, holiday gifts. Remembrance: After graduation, everyone went to different places. I really miss the days and nights at school. Why don't we print everyone's signature on the T-shirt as a permanent souvenir? "Related: class clothes, one-year-old souvenirs (printed baby footprints), special anniversary" Declaration of love: I have never had the courage to confess to her. Now I finally got up the courage to print a T-shirt for her with a declaration of my love on it. Maybe many years later, we will take it out, which is the eternal witness of our love! "Related: T-shirts for couples, T-shirts for parents and children, T-shirts for apologies, T-shirts for encouragement (printed with encouraging pictures or words)."