My brother is getting married October, and I have been permitted to attend the reception in Highland Dress. I am planning to wear an Argyll jacket with the rental bow tie and vest from the ceremony (I will be the Best Man). I had been, for some time, wishing to acquire an Argyll from J. Higgins, and this was the perfect opportunity. I promptly and gleefully ordered one in size 48R. Shortly after this, I was called by their customer service team and informed that 1.) Their jackets run small and 2.)My waist measurement of 46 inches, plus the ~2 inches of extra bulk from a kilt would require size 52, which measures 48in at the waist.

I understand that they have sold many of these jackets and that they probably know the sizing better than I, but I am wondering if this will result in a jacket which is too large in the critical chest/shoulder region... Could someone with experience with J. Higgins' jackets let me know how the sizing runs and if I'll be OK with a 52? I would greatly appreciate it.