Full and half-dress for April

The outfit of the man on the left (with knee-breeches, bicorne hat, elaborately-tied cravat, and buckled shoes) is more formal or "full", while the outfit of the man in the middle (with trousers and boots) is less formal (and so "half-dress", as being halfway between full dress and "undress", which at that time meant clothes suitable for lounging around the house only). Both men have suitable watch fobs and/or seals. The woman is wearing a scarf and a long pink coat over her white dress (which has a slight train), and is holding a parasol. The woman is dressed to go out walking, but the long hemline and train of her dress suggests that she's not expecting to go any great distance, or encounter wet or muddy ground.