Fashion in the 19th century was tailored and smart, but could be seen as 'so sombre, so depressing', as Lord Henry has it.
Women's clothing wasn't as extravagant as in previous decades, but corsets became even more important than before. Larger sleeves also became popular.
For men, lounge coats became the new trend for less formal occasions, and various outfits were donned depending on the activity undertaken by the gentleman (e.g. shooting, sailing or cycling).
However, the 1890s did see a growing acceptance of more individual artistic or aesthetic tastes as part of the mainstream fashion. Wilde was a prime example of such a dresser!