"I'm a long-time fan of your blog, but this is my first time writing you. I am in Glasgow, Scotland for the next month, so I was wondering if you might suggest some good shopping spots while I'm here. I'd be interested in traditional things such as tweeds, sweaters, wellies, etc."
I'm not too knowledgeable about shopping in Glasgow itself but there's some great architecture. The photo is of Pollok House.
Also North is Johnston's of Elgin, the largest cashmere weaver. They have a factory store.
Finally, you can get respectable shetland prices direct from Spirit of Shetland without leaving your computer.
High armholes are important however as they help the jacket ride the shoulders without the collar coming off the back of the neck.