If you would like to wear Slim FIt then choose the same size what you are wearing， if you would like to wear as normal and relax， then please choose one size up.
The first size table：
(US Small) --- Chest 36-38"， Shoulder 17.5"， Length 28.5"， Sleeve 25.0"
(US Medium)--- Chest 40-42"， Shoulder 18.5"， Length 29.3"， Sleeve 26"
(US LARGE) --- Chest 44-46"， Shoulder 19.3"， Length 30"， Sleeve 26.8"
(US XLARGE) -- Chest 46-48"， Shoulder 20"， Length 30.75"，Sleeve 27.5"
(US XX-LARGE) -Chest 50-54"， Shoulder 20.9"， Length 31.50"，Sleeve 28.3"
Second size table：
Asian M (US XS，165-170cm/55-60kg)
Asian L (US S，170-175cm/60-65kg)
Asian XL (US M，175-180cm/65-70kg)
Asian 2XL (US L，180-185cm/70-75kg)
Asian 3XL(US XL，182-187cm/75-80kg)
And the model try this shirt size:
- Height: 5.11"( 179 cms)
- Waist : 30"
- Weight: 160 LBS (72 kgs)
wearing size: ( US Medium ) Slim Fit