Considering this sports coat in 100% Angelico linen. Price at sale is 14.000 yen (a little over 100 euros). Maker is Taka-Q, Japanese mid-range chain brand.
Fits me pretty well, and I do not yet own a plaid sports coat (besides from one glenplaid and one windowpane suit jacket).
The competing candidate would be this piece from Suit Supply, at 260 euros:
This one is in a Wool Silk Linen fabric by EThomas (It), which is clearly more versatile then pure linen.