The organisers for the Royal Ascot have released their style guide for 2017 Ladies in the Royal Enclosure are asked to stick to skirts of a 'modest' length While there are strict guidelines to the size of your dress straps and headwear Etiquette expert William Hanson is 'horrified' by the introduction of the jumpsuit It's the most anticipated event in the racing calendar, and after more than 300 years it has become as famous for its unofficial fashion parade as its fixtures.