Trews and ... What?

[PlasticLoon]

EDIT - I was mistakenly using Arrochar when I should have been using Argyll. Arrochar is the material the jacket is made out of.

Good morning all,

I've had a search through past posts, but not been able to find anything which quite answers my question, so I thought I'd post here - please let me know if this is the wrong place.

My other half has very kindly bought me a set of trews, which were tailor-made. I then purchased a dark-blue tweed Arrochar jacket and 5 button waistcoat to go with them. We have a wedding to go to next month, and I believe that trews/Arrochar will make suitable day and evening wear.

I also have a number of formal events to go to over the next year and am wondering if a tweed Arrochar is entirely suitable for black tie events? My fiancée seems to think so, but I am something of a traditionalist and believe that black tie should be just that.

So my question is, should I just buy an ex-rental Prince Charlie jacket/waistcoat (the trews are fishtail and worn with braces), or is an Arrochar really acceptable?

Thanks in advance for any and all advice!

PL