When spawning particles from skeletalMesh vertices(using Skeleteal Vert/Surf Location), if the specified mesh is a cloth, some particles appear away from the mesh itself. This happens in 4.16 and 4.17 preview3.
1. Open the attached project(it contains clothes from Content Example, and a particle that spawn from skeletalMesh verts)
2. PIE or simulate to see some particles are displayed in totally different positions
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-48045 in the post.