I'm about as far from fashionable as you can get. I'm a jeans and t-shirt kind of guy, rarely seen in a collared shirt of any kind. However, I am working in a business-casual office and typically just wear khakis and a polo. It has gotten cold now and I'm trying to figure out some ways to wear a sweater. So far I've just been wearing them with an undershirt, but noticed that most people wear button-downs underneath them. I own a few button-downs, but hardly ever wear them because I hate ironing. Is it relatively fashionable to wear a pique polo underneath of a plan crew-neck sweater?