Sunday best
Whatever your place was within the social class system of the 19th century, you’re going to have your everyday clothing, but you’re also still going to have your Sunday best.
For men, that is a variation of the three-piece suit, made out of wools and natural fibres, which are actually incredibly breathable and comfortable even in hot weather.
For women, you’re going to be wearing a simplified version of the fashions of the time. For elite women in the 1890s, this would include big sleeves and beautifully bell-shaped skirts.