I believe it was woodhouse, don't know for sure, so don't hold me to it, maybe whnay or foo can point you in the right direction. Have you checked to see if dugdale or smiths perhaps carries a summer hopsack? If you're looking for an open weave with wrinkle-resistance, I would honestly go with the 0516 fresco, pair that with 500 501 511 512 519 fresco trousers and you have a solid summer wardrobe, especially if one of the greys is made as a full suit.
Edit: I stand corrected ^