This combination of a double breasted blazer and a black polo neck sweater will add alpha male essence to your ensemble. Complement this getup with black velvet tassel loafers and ta-da: this look is complete. When temps are starting to drop and autumn is in the air, you'll appreciate how great this outfit is for transitional weather. So if you're hunting for outfit ideas on how to dress in your 30s, this combo is definitely worth saving for later.