How can I know which size to choose?

For Clothing

Unisex:

• Small = 36" chest
• Medium = 38"-40" chest
• Large = 42 "-44" chest
• XL = 44"-46" chest
  
  

Girls:
All girls fitted shirts are approximately
girls UK size:

• S = 6-8
• M = 8-10
• L = 10-12