Overalls long ago ceased to perform exclusively utilitarian function. Often the image part plays a very important role.
The choice does not cause interest for many businessmen and that is why it is ignored. A better solution for such businessmen is serving logotype on clothing, like sweatshirt or order of the t-shirts, hoodies. Such an approach also ensures recognition of firm, understanding of potential customers.
In some sorts of btl-actions promotional costumes are applied - spectacular and colourful advertising anchors that effectively attract attention. There is also a sense in applying logo on the company clothing since under these conditions, it will be remembered at an intuitive level will complement the pleasant emotions of the event.