In case your structure has any neckline or centre front facings, these need to be sewn in place before you decide to connect the collar, as when the collar is ‘shut’ it's going to enclose the seam allowance of the garment and facings for your tidy finish.a) V?n b?n ?? ngh? công b? ?? ?i?u ki?n th?c hi?n ho?t ??ng quan tr?c môi tr??ng lao ??ng