I am new to the forum and was wandering if anyone had any information on where is best to find super lightweight,thin, 100% cotton blank t-shirts ?

Basically I am new to all of this, a close friend and I have decided upon taking a venture into the business of making our own urban tshirt line and label. We have started with our designs and we're wandering if there was a place that produce super lightweight ,soft,thin cotton tshirts as we were planning on making some prototypes so we can test our designs . It is important to note we are trying to make our brand to a high standard of quality so we are aiming to avoid such wholesalers like fruit of the loom etc.