The annoying thing about being fashionable is that it very often means being trendy and wearing the latest styles. This is hardly practical for someone who has little time or money.
I prefer to think of fashionable as a piece of clothing that is really timeless. It won't be out of style in 2 or even 7 years. It pairs well with other things. You don't have to chase any particular trend and you'll be able to hang on to that piece of clothing for awhile provided it's made well.
Timeless men's fashions
Gray and black, always timeless
“Fashionable usually means trendy and short-lived.”