I am 167 cm tall and weigh 65 kg. Recently, I purchased a jacket in camel/black, size S. Typically, I wear a size 48 in other brands such as Spidi, Dainese, and Revit. The size generally fits well, although the sleeves are slightly longer than those of a typical jacket. It would be preferable if Helston offered numeric sizing rather than using simple S, M, etc.

Overall, the leather and construction quality of this jacket are exceptional, on par with or perhaps even better than other premium brands like Dainese and Vanson. It is truly a beautiful piece—the most stylish jacket I own, and I have quite a collection. However, compared to similar jackets, this leather riding jacket is considerably stiffer, particularly the leather on the sleeves. Therefore, it will take a longer "break-in" period to become truly comfortable. I have been told that a few months of use will soften the jacket, especially the stiff sleeves.

Additionally, it's important to note that this jacket is "sealed" with an internal membrane, which makes it much warmer than a typical leather jacket. While it is great for temperatures around 10°C or even cooler, it may become too warm when the outside temperature exceeds 25°C.

Overall a fine jacket!

I think the sleeve length and hem length are too long for Asian people for riding.
But looks cool. will spend about 200$ to have it adjusted at a tailor. (I am a male, 168cm tall, 68kg, and need to shorten it by about 5cm).
The leather is soft and warm enough to run with just a T-shirt on, even at 10 degrees Celsius.
The one I had on hand had half the width of the stripes.

Bigger, but comfortable