Dinner jacket and matching trousers (vintage!) (New Marston OX3)

Dinner jacket and matching trousers. They are well-loved: bought second hand about 35 years ago. There's a small hole on left shoulder (absolutely no problem if you're wearing an academic gown too!), a snag on trousers (both shown in separate photos); also two buttons on trousers need replacing. I believe they are good quality wool, but there's no labels so can't be sure. I'm 38 short jacket, 32 short trousers, and these no longer quite fit me around the waist - so perhaps 30 inch waist?