The sizes produced by different manufacturers are slightly different, which should be distinguished according to the product size information. Standard numbers such as 175, 150, L or XL are acceptable. Thermal underwear, don't buy too big, just fit, it won't keep warm in space. Therefore, XXL is not recommended.
Extended data:
Clothing size comparison table
Size 29 = 2.2 feet waist = 73.5 cm.
30 yards = 2.3 feet waist =77CM
3 1 yard = 2.4 feet waist =80CM
Size 32 = 2.5 feet waist = 83.5 cm.
Size 33 = 2.6 feet waist =87CM
Size 34 = 2.7 feet waist =90CM
Size 36 = 2.8 feet waist = 93.5 cm.
Size 38 = 2.9 feet waist =97CM
40 yards = 3.0 feet waist circumference = 100CM