For day: Leather is often associated with nightwear and it can be tricky to get it correct for day, but there are plenty of alternatives to the conventional way of wearing it. Try a cropped leather jacket, which can easily be worn during the day with jeans. Or go for leather accessories like a belt or gloves.
For night: Get sexy in shape-forming leather. Dare to be different in a leather dress and experiment with different cuts, shapes and colours. Also be daring and try a pair of leather pants. They are super tight and not flattering on everyone, but if you have long, thin legs, you'll be right on trend with this one. There's definitely such a thing as too much leather, so keep it to a minimum.