The go-to for casual menswear style? A crew-neck t-shirt with a white long sleeve t-shirt. A pair of white canvas low top sneakers is a wonderful option to finish off your look. When temps are starting to drop and autumn is settling in, you'll love this getup as your go-to for unpredictable fall weather. This pairing demonstrates that as a gent in his thirties, you have a wide range of sartorial options.