This combination of a mustard crew-neck sweater and a long sleeve shirt is seriously stylish and yet it's practical and apt for anything. For a more laid-back twist, why not complete this ensemble with a pair of burgundy leather work boots? In winter, when comfort is the priority, it can be easy to settle for a less-than-stylish outfit. However, this outfit is a striking example that you totally can stay comfortable and remain stylish at the same time in winter. This combination shows that as a guy in his thirties, you have a vast array of outfit options.