A couple of notes to consider. Insignia was sewn on by the soldier, or by a regimental tailor (which were few and far between in the CASF), or by RCOC tailors. They could be hand sewn or machine sewn. And, nothing stopped a soldier from having the badges applied by private tailors or seamstress.
As Rick says, I would not be concerned by the style of sewing, but I would want to examine the type of thread, if insignia had been removed or added to the jacket and the type of insignia on the garment. This in itself in not a conclusive indication, but gives one a better understanding of what they examining.