He is merchant without any particular specialisation, so yes he should know about textiles and clothes production... and about more or less everything that can be monetised. be it accessories, fruits, metalurgy or livestock.
And again supply and demand in traditional sense doesn't apply on custom order between two individuals. Those are literaly matter of negotiation.
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"I am convinced that life is 10% what happens to me and 90% of how I react to it" (Charles R. Swindoll)
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