Foulard is an interesting word because it's a French loanword commonly used in Italian, referring to a lightweight silk scarf.
In the song, Umberto Tozzi sings about a "dolce vento di foulard" (sweet wind of a scarf), evoking a gentle, romantic image. It's a more elegant and specific term than a generic "sciarpa" (scarf), adding a touch of sophistication and uniqueness to the lyrics.
Umberto Tozzi's "Stella Stai" is a passionate plea to a beloved to stay, filled with vivid, almost dreamlike imagery. He calls out to his "stella" (star), asking her to remain with him "questa notte come se fosse lei / Fosse Dio / Fosse quello che ero io" (this night as if it were her / Were God / Were what I was). It's a powerful request for her presence to be all-encompassing, almost divine, and to fill the void of his past self.
He describes her with intriguing phrases like "dolce vento di foulard" (sweet wind of a scarf) and a "corpo a forma di esse" (body in the shape of an S), hinting at her graceful, perhaps elusive nature. There's a playful, almost desperate energy as he sings, "Voglio tenerti fra le mie / Braccia / Altrimenti torno a lei / Lo sai / Per questo, stella stai" (I want to hold you in my / Arms / Otherwise I'll go back to her / You know / That's why, star, stay). It's a raw confession of his need for her, suggesting she's the one who keeps him from returning to a past love or a lonely existence. The repeated "scivola" (slide) adds a rhythmic, almost hypnotic quality, like time slipping by, emphasizing his desire for her to stay in the moment.