I am 1.67 m tall and weigh 65 kg. The little one suits me. I also have a medium, loose but not insanely large. I love these shirts for everyday use at home and in the city. The fabric is very light and the loose sleeves make it comfortable to wear in warm weather. They are cotton so wash and dry with care unless you want them to shrink. The fabric is very soft which is the main reason I like them. I have 2 of these shirts and I can't talking about durability, but at this price point, you can afford to buy them back on a regular basis.
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