What causes clothing to shrink, will my shirt shrink?

i had bought a shirt that is 93% cotton and 7% spandex.. will this shirt shrink?? not in length, but otherwise? like around my body?? what causes clothing to shrink? is it both the washing and drying, or just the drying?? if i wash and just lay flat to dry, will it shrink? should i just return it and get a... show more i had bought a shirt that is 93% cotton and 7% spandex.. will this shirt shrink?? not in length, but otherwise? like around my body??

what causes clothing to shrink? is it both the washing and drying, or just the drying??

if i wash and just lay flat to dry, will it shrink?

should i just return it and get a different size?
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