What can cause this invinsable dress bug

[Ahmy]

Hey there

 

So I downloaded some outfits mods and some of them had this problem: here

 

 

 

I am new to modding sims so the main reason is to know the cause of the problem to prevent it in future as I have other outfits with the same problem (so far this only happened with the childs outfits) so I am not sure if it is because of a conflict with some of the adult mods

 

and this is the link to the outfit:

https://www.thesimsresource.com/downloads/details/category/sims4-clothing-female-child-everyday/title/blue-star-dress/id/1391639/

[procian]

Can't get the picture 

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When you say invisible do you mean the body has vanished?....this usually caused by a missing mesh....

Post a screenshot via the white paper clip....