Sizing varies a great deal, not only between manufacturers but also between differents styles from the same manufacturer. We try and give you as much information as we can on the product descriptions. If we feel a particular style runs on the tight side, we'll let you know on the listing. You can then use the guide below to get a better idea of what size to choose. If you need any help or advise, just drop us an email or fill in the contact us form.