Vintage Mademotselle Knitwear white short sleeve sweater

Vinatge from 1970 Mademotselle Knitwear white short sleeve sweater. It’s got a beautiful design around the neck and ribbed sleeves & waist! You will be one of the only ones wearing this cause it’s 53 yrs old and still in excellent condition and still VERY stylish! The tag is so old I can’t find a size or the material, it’s completely faded! But I’m guessing it’s a S/M