I wrote a article recently about how expensive Nigerian fashion is and how I just do not understand the metrics of it. Well, I just scoped this from The Nation website suggesting where you can get cheap tailoring materials;
To buy cheap tailoring materials in bulk, markets like Oshodi, Balogun on Lagos, Island and Aswani on the Oshodi Apapa Expressway, among other markets. in Lagos, stock them in large quantities.
Sometimes, the prices of these materials depend on their quantity. For example, a bundle of open and close, ordinary and invisible zips ranges from N 1,100 to N1,600 a bundle contains 10 dozens. The cost of thread is between N450 and N950 depending on its size. Needles go for N450 per pack and N10 per sachet, Scissors is sold for N100 and N300 depending on its size.
Suite lining cost N90 per yard, while elastics cost N1,100 and N800 for the tiny and large ones.