Quote Originally Posted by CMcG View Post
I believe the OP is talking about the Dress Blue jacket, which looks somewhat similar to a Kenmore doublet:
Quite apart from all the other comments that have been made re the suitability or unsuitability of this jacket for conversion I would add that it has a stiffened military collar. Highland jackets may have collars that superficially look similar but they are not stiffened military collars, being more akin to a mandarin collar which is far less rigid and does not close at the neck

Trying to replace the collar would, in my opinion, make the project liable to failure