Hello! I just acquired an INK hobo day Balenciaga. My question is does this style actually break in to stay on your shoulder after a while? I tried it on today and honestly, it keeps slipping off my shoulder. My city shoulder strap stayed on better but of course the city bag was broken in. Any info would be greatly appreciated. The tags are still on it so I could return for another style. I really wanted a "shoulder bag" cause I have a baby and my hands are super full when I go out.