Such essentials as a navy parka and grey jeans are an easy way to inject extra cool into your casual styling rotation. For a truly modern on and off-duty mix, complete this ensemble with a pair of dark brown suede chelsea boots. When it's one of those dreary autumn days, sometimes only a neat look like this one can get you out the door in the morning. When it comes to casual dressing ideas for men in their 30s, this getup looks nice on almost any gent.