Clothing designers have them...certain details that are always present in their collections. Details like how they cut the fabric or a type of fabric that appears in many of their collections, specific colors they use, or the way they fit a garment. Sewers have them too...fabric types that you gravitate towards, certain pieces that you make more often than others, or seaming details that you use repeatedly.
My sewing trademark would be sleeve detailing. I pay particular attention to my sleeves so that I can hide a figure challenge ~ notice that I did not call it a flaw! I do certain things to sleeves to make them work for me...short sleeves are cut a certain length to camouflage but still give a flair to the garment or its cut on the bias to add a little more space to the bicep area without changing the overall shape of the sleeve. Jacket and cardigan sleeves get particular attention because you want to have a well-fitted garment and the sleeve treatment if done improperly can definitely shout, "made with loving hands at home." Not only do I take extra time to measure, fit and adjust sleeve width but I usually add some sort of a seaming detail to give the finished sleeve a slimmer effect.
But this is my trademark...you can see these features in almost every sleeve I make on almost every garment I construct. So what would be your sewing trademark? What detail do you constantly add to most of your garments? What sets them apart as a "fill in your name" original? Or have you ever given it much thought? Examine your garments and see what sewing, cutting or fitting detail they all share and realize that you have a trademark too!