finding your ideal size measure around the fullest part of your chest/bust keeping the tape under the upper arms and around the shoulder blades. alternatively, lie your favourite t-shirt flat and measure the width across the chest directly under the arms. this figure needs to be doubled to arrive at the correct chest size. boys' sizes: S(36")(91cm), M(38")(97cm), L(40")(102cm), XL(42/44")(107-112cm), XXL(46/48")(117-122cm) european girls' sizes correspond approximately to these chest sizes: 32"=40, 34"=42, 36"=44, 38"=46, 40"=48, 42"=50 extra small & extra large size t-shirts we thought, if we can do it for our friends we could do it for everybody else too! we now offer an extended size range on many of our designs. so, if you can't see the design you like in the size you need, we may be able to help! tell us about your requirements! your message:  your email address:  your email address will not be used for promotional purposes