Yes, it's a typo. I just read through the pattern for the gold-colored evening bag.
The strap needs to be long enough to go around your waist or (if you prefer) just below your waist. Depending on your own measurements, this could be 115 cm (= 1.15 m) or maybe a little more. Consult a tape measure with both common and metric units on it to be sure; it would be too bad to put in a lot of work and not have the bag fit!