I think it is a wonderful tribute to wear a tartan in someone's honor; If a father's son were to wear the USMC tartan in respect of his father's service, I cannot think of anything more touching. Should a stepson show his love and respect for the man that accepts him and fosters him as his own by wearing his tartan, it is a grand and beautiful gesture. I would never think to question someone's choice in selecting a tartan to which they are not "truly" affiliated - it is simply a choice of fashion and I have no issue with that. I do think that should I encounter someone wearing a kilt in tartan of a dear friend as a show of loyalty and thanks for coming into their life, of a branch of their family to which they are related by marriage only but to which they feel commitment and bond, or the tartan of a military branch in order to honor their losses and service - this is this gesture that would bring a tear to my eye and make me proud to have met such a person.

I do not have my own tartan and as such wear the county tartans of Ireland - if I had my own and happened upon someone unassociated wearing my colors, I would be proud that they had been chosen - I would view their choice of my tartan with pride.