Shirt (The Witcher 3: Wild Hunt)

buy from a
spoiler-elf-tranny in Novigrad, he is engaged in sewing clothes.

yes, almost all traders have it

I also remembered about him, but where is he?

Oleg Morgunov in Zastenya, green mark:



In general, most of the "armored vehicles" (for example - armored personnel in Oxenfurt, in the main market of Novigrad, in Vrestry, etc.). besides - there is also Susta's tailor in Kaer-Trolde (with whom we finish the quest of gwent on Skelig, on the map it is indicated by the "hairdresser" icon;))
Well, ordinary bandits (in particular, street bandits in Novigrad) often drop