Do you by any chance do hand bags or shoes? I'm looking for someone to make some samples for me.
I agree with your posting entirely. I am also looking to manufacture a line of yoga clothing for men using UK based seamstresses / tailors etc. After trawling the internet for leads all im finding are people offering wedding dress alterations etc.
I had thought to approach colleges / universities direct and seeing if there would be a way of arranging a work project as part of a fashion design / textiles final year- this could be a paid for project.
Your idea of forming a co-operative is a great one - If a few small businesses like us get together to form a buying-group we maybe would have enough buying power to interest such a co-operative.
I see your posting was six months ago so let me know if you have got any further with your searching, im the mean time I'll keep looking - cheers!
I know some manufacturers but are from China, Bali, Vietnam... I only know a company that work in Spain. It is: http://www.ivorybrand.com/
They do clothes and they also sell your products. They have nice thinks. You can contact by the contact section.
Good luck! Have a nice day