A midi length trench in pure cotton or a cotton-rich blend gives you the full trench formula without the ankle-length commitment. The midi hem hits at the knee or just below which means it works with everything from trainers to heels and with every trouser or dress length you already own. Cotton breathes better than heavier fabrics which makes a midi trench genuinely wearable across seasons rather than just in peak winter months. The length also means the coat reads as less formal than a full-length version which opens up more styling possibilities. These midi trench coats work as effectively over summer dresses as they do over autumn layers.