I would suggest a nice cable-knit/Aran style sweater, especially during this season. I've seen several pipe bands wearing them for "No. 2" dress, and it looks really sharp, INMHO.

And in regards to Robin's question about bonnets in church, it depends: I have seen covers worn in church by pipers and colour parties when "on parade", and I have seen them removed -- best to ask the Padre and see what their preference is, since they're "officer commanding"! :mrgreen:

Cheers,

Todd