This is really sexy on.  It comes in 2 pieces, the bustier and then the part that goes around the neck.  I actually like that.  Now, I have the option to wear the collar piece or not.  I had to loosen the back some to be able to latch the front and then tighten the back again.  Make sure to fix the insert in the back so it is pulled all the way over.  In the photo I uploaded, you will see that it is not.  As for the collar, it is cute, but fits a little snug under the arm pit.  It is not laying down on the bustier like in the picture.  I may need to steam it bit to get the packaging wrinkle out. The part around the neck velcros together in the front for closure.  And to make the buckle sit down, I had to loosen it some.  I ordered this in a Large and fits great.  I'm 5'5" about 170 pds and a 34B/C.