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The only processing facility we know of is actually in Sweden and they are called Korallen: http://korallen.se
What I know is that they do garments, but I am sure they could also manage materials. You can call or email and check with them.What I would also do is check with the linen mill, where you bought the fabric and talk to them to do this finish for you. If they can’t, they can recommend you a subcontractor, preferably local that can do this. What you do not want is to ship the material all over Europe and end up losing money on this.
Is another option that you actually create the garment and then stone wash it?