It's not oil cloth. It's a cotton fabric that's been waxed. That's very common in England. From Barbour's website.
Q. How often do you recommend reproofing a wax jacket and can I do it myself?
A. It all depends on the amount of use of the jacket and how it is stored. With regular wear we would recommend that it is re-proofed every year.
You can reproof the jacket yourself by purchasing a tin of Barbour Thornproof Dressing from a Barbour stockist and carefully follow the instructions on the tin.
Q. My wax jacket is dirty how can I clean it?
A. The only way you can clean your waxed cotton garment is to sponge it down with clean cold water - including the inner lining.
Do not use soaps or detergents, wash in a washing machine or dry clean as this would permanently damage the garment and any re-application of the wax coating will be totally absorbed by the cotton fabric and will soil the inner lining. This in turn, will soil any clothing worn underneath the jacket.
Q. How do I wash a waterproof / breathable jacket?
A. Please refer to the washing instructions sewn into each garment. Generally all Barbour waterproof breathable outerwear can be machine or hand-washed at 30 degrees. The use of a 'non-detergent soap' such as Nikwax Techwash is recommended for waterproof breathable garments. Fabric softeners should not be used as these prevent the durable water repellent treatment from working effectively.
Q. Can I dry clean my Barbour wax jacket?
A. No, unfortunately you cannot dry clean Barbour wax garments. The chemical process used in dry cleaning may permanently damage or remove the proofing.
Q. I've put my wax jacket into a washing machine to clean it and now all the wax has come off. What can I do?
A. Unfortunately there is nothing that can be done as the washing process strips all the wax finish from the cotton fabric. Any re-application of the wax coating will be totally absorbed by the cotton fabric and will soil the inner lining which, in turn, will soil any clothing worn underneath.
http://www.barbour.com/us/customer-services
Here's a link to a site that tells how to rewax the coat. It's obvious from the instructions that it's a wax not an oil. Note the suggestion of using a non-detergent soap.
http://lark-blogvancouver.blogspot.c...-dressing.html