There's no fashion if nobody buys it basically means that if no one wants it then it's probably not very good or that if no one buys it then it's just trash and you should throw it away.
The renaissance was a time period in the europe where art, lituature, and music were blooming and being heavily introduced, emphasized, and improved. It occured in the 13th and early 14th century, 1280-1400.
