"I like the fact that Jack is always wearing a tie except when he's on a mission. I do like it when I get out there and dress up, or dress down, a little bit"

Victor Garber is revealing his affection for Jack, who is constantly wearing a tie other than when he is on an objective. This indicates that Jack is an expert and takes his task seriously. At the very same time, Victor Garber likewise appreciates the fact that Jack is willing to dress up or dress down depending upon the scenario. This shows that Jack is versatile and can adapt to various environments. It is clear that Victor Garber admires Jack's professionalism and his ability to get used to various scenarios. This quote is a testament to the respect Victor Garber has for Jack and his dedication to his job.