Or, at least they weren't in England, according to this article! It seems like the peasants liked to dress as nicely as anyone else when they could, and apparently they were often able to put together the money to buy nice accessories, too. These accessories may not have been as "fancy" as the dress and accessories of lords and ladies, but they weren't the plain, dull stuff some people picture them in. Naturally, the "higher orders" thought the peasants should "stay in their place", and churchmen especially, decried "fancy" clothing for the peasant class. And, equally naturally, the peasants didn't agree, and went on buying "fancy" stuff anyway, whenever they could, and wore such things when the occasion demanded. Which might have also been more often than you might suppose, since there were lots of feast days, harvests, etc., where people tried to dress in their best.