You may also consider the area you found your family (as best you can tell) is from. There are many tartans that represent districts, and areas, an example being Isle of Skye. You may find a tartan that is beautiful to you that would be appropriate before you find a particular family or clan connection.

My family has been in America since 1637 but I found the last connection to my Scottish clan and will eventually get a kilt in that tartan. Until then, I wear the U.S.Army tartan (as a veteran) and the Confederate Memorial (I'm a North Carolina child). I could wear other tartans that fit my tastes in color and pattern (like the Carolina tartan) as well because I can explain my attraction.

I recommend you don't worry too much on getting an exact tartan before you search deeper into the genealogy or are just compelled with a tartan that you are attracted to.