Not expensive copy. "Herringbone" (HBT, Fischgrätmuster) fabric.
Jackets without packaging, look like new. Perhaps they were used on a mannequin, tried on, etc.
How to choose the size?
Use a flexible meter or at least a rope. Compare any jacket that suits you with the table below.
Chest - the girth of the bare chest under the armpits.
Shoulders - shoulders span (key size): from one sleeve to another along the shoulder seam and behind the neck.
Sleeve - sleeve length (along the longest side).
You choose the size you need from those in the list near "Add to Cart" button. No other sizes and no restocking.
Dot suits were used in the Waffen-SS from March 1944 on. Original "Dot" jacket (in good condition) is estimated at $3500 among collectors. Prices are rising.