Nearly all boy patterns are drafted to be unisex. These are ones that I have used primarily for my boys, but be sure to check out my unisex pattern reviews too!
Basic Blazer by Blank Slate Patterns
Berkshire Blazer by Blank Slate Patterns
Big Island Board Shorts by Blank Slate Patterns
Blank Tank by Blank Slate Patterns
Prepster Pullover by Blank Slate Patterns
Sketchbook Shirt by Oliver + S
Vintage V-Neck by Blank Slate Patterns