Bought either ready made or cut down from trews, these are 'Take Ivy' items at their best.  Excellent on these hot days, worn at the correct length, with loafers or Docksides.  But, as Moose has observed with reference to the Madras jacket, the accompanying garment must be restrained.  A plain white t will do it for most.  I like a pale blue Brooks half-sleeve.  L.L. Bean do a nice pair.  But they won't bleed.