The even slipstitch is used to join two folded edges together, using a barely-visible stitch. This stitch is often used to mend a seam from the right side when the wrong side is difficult together (for instance, there may be a lining in your way).
encircles the neck and frames the face at the neckline of a garment. It may stand away from the body or lay flat. There are endless design possibilities for collars.
a finished slit or opening of a garment. Men's button-down shirts are great, common examples of plackets: they are at center front, where the bottons are, and at the back of the sleeves where the cuff opens.
Darts are used to shape a garment by taking away fullness in the middle of a pattern piece, away from a seam line. Darts are generally wedge or triangle shaped and are often used at the waistline, shoulderblade, and bust.
Every fabric has its life term, and when wool has come to its end days the first sign to notice is Piling. Piling refers to those little fussy balls your sweater begins to get when it is getting old.