Not a personal endorsement but The Kilt Experience in the Sottish Borders offer made to measure, hand-sewn kilts and bespoke tweed waistcoats and jackets. I understand they largely source their kilting materials from Lochcarron and tweeds from the Lovat Mill - both of which are located in nearby Selkirk. They also do their own leather work and sporrans.

https://www.thekiltexperience.com/be...lt-outfitters/