Model Reference (180cm / 73kg): Wearing size XL. The shoulder line fits precisely with moderate chest room; the length falls about 10cm below the waist, presenting a sharp urban proportion.
Estimation (175cm / 65kg): Size L is recommended to maintain the original structural feel while keeping the waistline fluid.
Estimation (165cm / 55kg): Size M. If you have narrower shoulders, pair with voluminous wide pants and platform shoes to balance the upper structural lines and prevent a fragile visual profile.