Vintage Light-Terry Maxi Dress-L/XL

I can only describe the material as an extremely light terry cloth. White with rainbow striped pockets. Drawstring-like sleeves. No size tags but I think Large/XL. Please see measurements below. The only label is a Canadian Union one! Impeccable condition! Armpit to armpit: 52cm Top of pocket across: 56cm Below pocket across: 62cm Total length from top of sleeve strap (a little drawn): 129cm Je parle français :)