As you can see, it's also noticeable whilst wearing the ToS female uniform.
It's not noticeable whilst wearing any other uniform as the collar covers that part of the neck.
Remembering back to the bonus features and commentaries in DS9, i remember that for Lt. Dax, just below the collar line is where the spots stopped, and the artist put his name, and the date on her neck there as I recall... along with the # of times he had painted her spots. Maybe Cryptic is trying to do something like that? u should look reeeeelly closely. maybe they have something written?
Yeah I have a Trill or three and those spots are mean't to go all the way down from head to toe (just check out any trill in those sweet tos minis^^). The graphic is missing indeed wearing those clothes in combination as you say. Fix please Cryptic those Trill need their spots!