A buff-colored cloth is typically referred to as "buff" itself, which describes a light yellow-brown shade. This term is often used in textiles and fashion to denote this specific color. Additionally, materials like suede or leather can also be described as buff when they have a similar hue.
Collared Dove
Nankeen
Polish?
This is Nankeen - a yellow/buff fabric popular in the 17th/18th centuries and named after Nanking in China.
use a thick cloth and polish
silk
A film buff.
Lungi
Yes, use it full strength on a clean cloth to clean the leather and use another clean cloth to buff the seat.
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A Pug