Did you know Pact use synthetic thread/stitching?

I just purchased clothing from Pact. I was so happy to have found clothing in 100% organic cotton. When i received them i got suspicious as the stitching and details looked to be synthetic. I have now received confirmation from Pact that clothes they market as 100% organic cotton actually is not, as they only let us know the main material. Any tips on where i can get basic clothes that actually is 100% organic cotton?