Quote Originally Posted by piperalpha View Post
What kind of Jacket is with the double breasted Tartan waistcoat. I’m quite taken with the pairing
It's a rather nice bespoke-made regulation doublet c1930s-40s, with the buttons leaning out from the centre.

The second is another c1960s regulation doublet, but with the bottons in line with the front edges, which gives the impression the line of the buttons leans in to the centre. It has borrowed the waistcoat from the Prince Charlie to have its picture taken. This one also has an unusual breat welted pocket (like an English evening tail-coat) and has additional ticket-pockets hidden under the 'tashes'.

Neither regulation doublet has its own matchng waistcoat, as white, coloured or tartan, or none was the usual way with them.

Bottom picture is Prince Charlie and waistcoat as normal. The PC has hidden pockets in the 'tails' at the back (like the above-mentioned tail-coats had) which was where opera-programmes and dance-cards used to get carried to keep the hands free.