I have a black argyll and I have worn it at a wedding, with a tie, and kilt. Very nice semi formal look. My wife still get's compliments from her cousin (the bride).
I have worn the same kilt & jacket with tux shirt & black bow tie at a black tie affair & I was the hit of ball. I did not buy a PC because I don't expect to wear the formal get up more than once a year (decade).
Seems like a great alternative to buying multiple jackets.
David