This is the dilemma a lot of our customers face, so we will try and help you out a bit. First of all, consider your height. The model in the photos is 5’10” or 5’11” so the Short Sleep Shirt looks pretty short on her, but most of us aren’t blessed with those heights, so on an average height person (let’s say 5’6”) the Short Sleep Shirt will fall just above the knee. It is perfect for sleeping in and hanging around the house, but if you are like our founder Alexandra and you’re chasing kids around and staying with the in-laws, you may want to go for the Long Sleep Shirt. It falls below the knee and offers a bit more coverage. The Long Sleep Shirt is also better for winter if you live somewhere cold (and your heating isn’t on super high.) If you’d like your nightshirt to be a little cheeky (we won’t say sexy since we’ll be the first to admit that our nightshirts aren’t the sexiest of sleepwear) then go for the Short Sleep Shirt. You’ll show a bit of leg but you will still be really comfortable.