I visited Craigievar Castle, near Alford in Aberdeenshire, on Saturday:

At the end of the gallery on the top floor was an early 19 Century kilt and doublet of Forbes tartan that had belonged to the piper. The round buttons appear to be silver.

The kilt was box pleated. This picture shows the first pleat on the left of the kilt, the plaid behind it and the cuff detail on the left sleeve: