The length of your kilt drop will depend on how high you want to wear the kilt on your waist. If wearing a short jacket such as a Prince Charlie, you may want to have your kilt an inch or two longer so that it sits higher on your waist. However, standard kilts should always be worn to the middle of the knee cap, while military kilts are worn a little shorter to the top of the knee cap. When measuring the kilt length, the wearer should kneel and have someone take a measurement from where the top of the kilt will sit, down to the floor. Where you wear the kilt on your waist is entirely up to you, and is down to personal preference. However the standard height is around the navel and as a result it is worth noting that your kilt waist size may be slightly larger than your trouser waist size.