It's the Bruce tartan (ancient colors). His last name is Carruthers, if I remember correctly, which is one of the septs (families) of the Bruce clan.

You are correct, the Wolfe tartan greatly resembles the Bruce. It was designed in or around 1950. There was/is a trend for tartan suppliers to design "Irish family tartans" to fill an order by altering pre-existing Scottish tartans, so it is not surprising to see a resemblence.

See:
http://blog.albanach.org/2005/11/iri...artans-in.html