Bleachers: i.e. the "Grannies" of today's shirtmakers. Till the mid-1800s they were, within the Dressmakers' Guild, the experts whose task it was not just to produce shirts and blouses but to also wash and iron them.
Monogram: a refined shirt complement which must be embroidered on the front left, 12-15cm above the waistline, in a contrasting colour (preferably blue) if the shirt is in linen or cotton, or the same colour if the shirt is in silk.
Two dozen: according to contemporary "arbiter elegantiarum", this is the right number of shirts a refined man should keep in his wardrobe.