All the FA rules on kit and equipment after shirt clash confusion at Blackpool v Sunderland

Kit clashes in two of last night's mid-week EFL clashes - Millwall v Sheffield Wednesday and Blackpool v Sunderland - have sparked debate online as fans struggled to distinguish their players from their opponents.
Blackpool v SunderlandBlackpool v Sunderland
Blackpool v Sunderland

But what are the FA rules on kit and equipment, and how is it enforced? Click and scroll through the rules below...