Is this a men's or women's t-shirt?

It is listed as womenswear, but the XX-Large fit is generous and boxy. Check the measurements against a tee you already own before buying.

How does vintage Prada sizing compare to new Prada?

1990s Prada cuts tend to run larger and boxier than current slim-fit tees. Treat the XX-Large label as a guide, not a match for today's sizing.

What condition is the shirt in?

It is described as very good vintage condition. Expect minor signs of age on pre-owned cotton, and ask for close-up photos of the collar, seams and print if you want detail.

What is the shirt made of?

It is cotton in a cream color. Cotton of this era is typically soft and breathable but can fade or thin with washing.

Is it worth buying a vintage Prada tee over a new one?

You get the Prada label and a 1990s cut that new tees do not reproduce. You give up new condition and a full size run, so it depends on whether the fit and era matter more to you.