I've been wearing a topper for about 5 years & have been very happy with them, however I'm noticing thinning at the bottom of my neckline in the back which is starting to puzzle me. If I were to go with a full cap, how easy or difficult is the attachment? My style is usually pretty short to medium on top & pretty close on sides & back (the messy fawx hawk look)

OR..is there a thickener or filler I could use to cover up the thin area at the neckline?

Thanks guys.