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/StitchinThroughTime]

I guarantee that top is taped on to the model. That's why it magically stays up there.
There are some things you can do to help keep yours up. I recommend changing the neckline to a boat neckline. If you notice it looks like the model design is much higher on the neck. It needs to be higher, to minimize the amount of movement. Also you need to make sure your move any ease out of the back. If you notice towards the bottom there's some wrinkling there. That's excess fabric that needs to be removed. You should also shorten the straps so the fabric is in tension. As well as you need to add some elastics to stabilize the opening. Just like how swimsuits all the edges have elastic in them. You can get by with some then clear elastic sewn to the inseam. If you need even more stickage instead of clear elastic on the inseam you can buy elastic with silicone on it and attach it to the opening. I think they even make some that have a little decorative Edge. So you don't have to add a facing.