These T-shirts are nicely sized
Small UK 8/10 (Actual measurements - Armpit to armpit 42cm, neck to bottom of T-shirt 59cm)
Med UK 10/12 (Actual measurements - Armpit to armpit 45cm, neck to bottom of T-shirt 61cm)
Lge UK 12/14 (Actual measurements - Armpit to armpit 46cm, neck to bottom of T-shirt 65cm)
X/Lge UK 14/16 (Actual measurements - Armpit to armpit 50cm, neck to bottom of T-shirt 66cm)
XX/Lge UK 16/18 (Actual measurements - Armpit to armpit 52cm, neck to bottom of T-shirt 69cm)