Fashion rules are made to be broken; this is true of the trendy tie-and-jeans combo. Slim styles work well, while low-to-medium rise jeans with a close -- but not leg-hugging -- cut are timelessly dependable. Please don’t wear baggy jeans, those made of shiny synthetic fabrics this can work against your tie rather than with it.
You can make a tie work with just a dress shirt and jeans, so long as the shirt is neatly tucked and not too puffy. Honor your neat tie with a proper shirt fit; always fit to your neck size and arm length. Semi-spread collars, rolled sleeves and a nice leather watch all work within this middle-ground of casual and formal.
Take a look at some styles.