When you did the shoulders. You said you finished off with the serger then pressed it back and one topstitch. And sorry I'm new to sewing... so you sewed first, then you did like a 3 seam serge but the needle thread catches 'right'? Of the first sewing so it won't show on the outside right? Then you press back and top stitch showing only two on the outside? Or did you serge only, then top stitch? TIA :)