You'll be surprised at how easy it is for any man to put together this casual ensemble. Just a white long sleeve shirt teamed with a red and white horizontal striped long sleeve t-shirt. If you want to break out of the mold a little, throw in a pair of dark brown leather loafers. Stick with this one if you're looking for a standout summery outfit. Sport this ensemble to achieve a more conservative look as a man in his thirties.