"that she is Mrs. Martin, aged thirty-six, dressed in blue, wearing a black hat and brown shoes"
'The Conversation' by Hofheinz-Döring (1979)
Creative Commons Attribution Share Alike'The Conversation' by Hofheinz-Döring (1979) - Credit: Marget Hofheinz-Döring/Galerie Brigitte Mauch Göppingen

At this point, it is not clear  whether the choice of the name 'Mrs Martin' and the description of her clothes etc. is meant to have any particular significance for the reader.

If there is any significance, can anyone throw any light on what it might be?

... or maybe,  'Mrs Martin' is just the female equivalent of 'the man on the Clapham omnibus'?