When you are wearing a tie with no jacket, wear a tie bar. It helps the tie look grounded to the outfit and literally keeps it "grounded" or attached to the shirt. This keeps the tie from looking out of place and helps tie the outfit in together. We at Dandy Fashioner believe that ties must be worn without jackets, so just throw on a tie bar to keep it looking right.
In the picture, notice also the use of multiple patterns in the outfit. Bold striped shirt, blue tie with red anchors and a small plaid to the pants. By following the rules of patterns, the outfit works well together and is not over-powering to the eye.
It also has just the right amount of sprezzatura: rolled up sleeves, undone & crooked tie and multiple patterns. The outfit looks thrown together, but took some planning to make it all fit together well.