I'd like to suggest SEH Kelly but they don't really do a plain mac in blue so you'd have to go really far to find anything better than the Macintosh x Loro Piana coat, and it's in the sales currently
https://www.mackintosh.com/gb/shopping/navy-wool-storm-system-mackintosh-coat-12569053
That'll leave you with some nice wet knees, according to the photo on their site!
@JB started
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I'd like to suggest SEH Kelly but they don't really do a plain mac in blue so you'd have to go really far to find anything better than the Macintosh x Loro Piana coat, and it's in the sales currently
https://www.mackintosh.com/gb/shopping/navy-wool-storm-system-mackintosh-coat-12569053