Here we’ll go over how to attach a collar when the garment has no facings in use. The Book says, “This method is often used with a stand or mandarin collar.” –Prepare collar of your choice. I went with mandarin.
-Sew shoulder seams of garment together
Finish the front placket or opening
Pin the collar to the right side of the garment, raw edges of the collar matching. Only pin the lower layer of the collar. Match all important points, like center, shoulder seams, etc
Sew that lower layer to the top edge of the garment
Flip the garment over and:
-Press the seam allowance from the lower layer up into the collar
-Press the raw edge of the upper layer underneath, also into the collar Press, pin and sew the unsewn layer just below the stitched neckline seam
And you’re done! Way to go!