Hi, Jeannie, and welcome to X Marks from the bottom end of Africa.
I hope you track down the tartan you are looking for and get your grandson a kilt in it.
My daughter-in-law is expecting a wee lad to be born at the end of March. I plan to get him an infant’s kilt.
Of course you need to get your own tartan skirt too (if you don’t have one already).
Regards,
Mike