This combination of a black v-neck t-shirt and sweatpants will allow you to demonstrate your prowess in menswear styling even on dress-down days. White low top sneakers will instantly smarten up even your most comfortable clothes. Undoubtedly, it's easier to work through a boiling hot summer afternoon in a summery ensemble like this. Wondering how to perfect casual dressing as you go into your 40s? This combo is the perfect answer.