He has more intelligence than would appear, this longfaced Monsieur Lawrence of yours!" I did not myself think very highly of Lawrence's intelligence; but I forebore to contradict Poirot, and gently took him to task for forgetting my instructions as to which were Cynthia's days off. 
Poirot believed that Monsieur Lawrence's intelligence had been underestimated.
The man is wearing a pink suit.