I have seen this happen alot in my dojo... The sell cheaply made Gis, poly/cotton blend, that being to wear out very quickly. Being that you by know know about what color etc gi you would need, black , white, vneck etc, ask your instructor if it will be alright to buy your own uniform. Then go outt, do some research, I think adidas sells some good Vneck TKD uniforms, and order it. I doubt your instructor should have a problem you using your own gi , unless generating revenues for continously selling the same substandard gi is how they like to run things.