Best advice i can offer is from varusteleka...
Size info
First the easy size, then the user's recommended height and chest circumference. These run a tad large to fit clothes underneath, so do not oversize. If you intend to use this as a casual jacket, picking a notch slimmer size than the measurements say would do just fine.
Our model in the main picture has a 96 cm chest, but the jacket worn is Small Regular (171-179 / 84-92 cm) and fits much better.
The Austrian size system is explained in detail on our
Austrian jacket size chart page. If you are already familiar with Austrian sizing and want to know how we came up with the easy sizes, below is our logic as a chart. All possible sizes in the chart are not manufactured of course.