Hello Simmers!

I created my first CC dress and it’s not been going smoothly… this issue has me stumped.

In the sims 4 my dress shows up with a strange spike sticking right out of the front that seems to be attached to my bow/lace at the top but I cannot find it in blender and it does not show up in s4s either.

I have all textures and maps in place, the body is joined to the dress. It is weight painted and vertex painted. I removed doubles with 0.0001 distance and my UVs look normal. I have no idea where this came from since it wasn’t always there during different tests I did in game.

Maybe you know more

The most likely culprit for strange geometry ingame vs in meshing software is bone weights and/or morphs, the two factors that aren't immediately in effect in Blender.
My suggestions are limited by being experienced with these topics for TS3 and not TS4, but hopefully that's a lead for what may need to be redone.

Little details that smooth can also be extremely high poly, which could be contributing to why the issue is in that area.