model pulling apart when skinning I am working on skinning a character using automatic weights, and weight paint. As I work, I am finding it difficult to keep seams together, and stitching stuck to the model while keeping things smooth. Does anyone have some techniques or words of wisdom to help with this?
Default pose

Posed
I'm not sure though why that happened. But  you can join the sleeve and stitches with ctrl+J in object mode if they are sperate object. Or select every thing,  go to edit mode and search for (merge by distace) option (F3). And apply it.  It will join the vertices which almost share the same place.
Remember  after doing this you have re assign the weight.
Hope that helps.