Mull, you asked about alternatives to the PC. There is an earlier thread in this forum (Formal jackets and the cookie cutter aversion) which covers some of the ground you may want to plow. Getting pictures is another thing entirely. You can search the four or five biggest highland outfitters' sites and you will quickly recognize what is pointed out on the cookie cutter thread- that names are not consistent from one tailor to another. You will also notice the excellent contributions of Ted Crocker, who has gone silent of late. Searching for "doublet" will give you some lovely pictures on this forum.

Without duplicating that earlier thread, I have come to think of the following menu of choices:

1) Single or double breasted
2) Flaps / tails or none
3) Cuff style (plain, bucket, military)
4) High collar or lapels
5) Waist ( belted? open? Cut away?)

Almost all of these options can be combined with any other combination. You can also add in contrasting elements, be they facings, trims, etc. You can choose from a wide array of fabrics: wool, velvet, silk, cotton, as well as colors and patterns ( Tartan on the square, tartan on the bias) and some of the fabrics can be combined with others. A rich man could easily have a dozen different formal jackets and none of them a Black Prince Charlie. I wish I had more occasions to wear the few I have.