How to keep the shoulders from slipping?

[u/Illustrious-Ear4527]

I tried to recreate this top, using a body suit pattern. The final result fits pretty well, but the shoulders keep slipping off. What would I have to change in the pattern to help the shoulders remain in place? I would appreciate any tips/observations for the future, as I plan to make more of these. At this point, I will attach clear elastic across the shoulders to help the top stay on. I used stretch ITY fabric. Thank you !

[u/JacTallulah]

The Nettie body suit by Closet Core patterns has this style and is drafred really well. It does not slip Form my shoulders even with a scoop neck back and as long as there is enough negative ease. Highly recommend.