Green Envelope black and white striped medium top

Green Envelope black and white striped medium top. The sleeves seem to be about elbow length, but according to my sister who wore this, if you're shorter, they may fit at quarter length. The shirt has some fuzzies from washing and wear, but it has no holes, tears, or stains. Soft and comfy, but I am unsure of the material. smoke free home 8/21 measurements laying flat: chest: 21 in waist: 18 in length: 24 in sleeve length: 17 in