Gucci?

Expensive clothing store

https://www.gucci.com/us/en/ca/men/ready-to-wear-for-men/t-shirts-and-polos-for-men-c-men-readytowear-tshirts-and-polos

I m aware that it's a hell expensive Swiss brand I was just a bit surprised to see it at d collar of his shirt with a flower

Or italian, don't remember exactly

Oh I see. It is Italian. The flower is probably there to avoid issues with the companies. The same with Starbucks being st*rbucks in chapter 3.