Is it right to say that ties and scarves are clothing accessories? Yes they are accessories but maybe you can say also they are clothes or clothing items. They clothe the body in a way that jewelery can't. Certain jewelery can cover or 'give a second skin' to the body but ties and scarves do more than this. Ties and scarves also give a finish to a 'look' in a way that a bag or jewelery may not do. So in this way they are not accessories. Or at least they are certainly different kinds of accessories to jewelery or bags.
Scarves can be worn outside the outfit, over a coat. But this article generally considers the 'look' when scarves are worn 'inside' a coat or jacket or at least over a shirt but without s jacket or coat. Yes what about the look where the tie and scarf are worn 'inside'? Mention is made in this article of ties ,scarves worn in a certain look e.g. with a faux fur jacket...or another type of waist length jacket.
Suppose you have a faux fur jacket with a heavy lapel and then inside you have a blouse or shirt then the scarf can be perhaps worn as an extra clothing item. It is worth noting that many shops don't sell individual looks or at least shops can never sell a truly individual look to you. You want to create your own look. And here is a look that incorporates ties, scarves. Indeed it is is doubtful that a shop sells a scarf next to a faux fur jacket but you can choose to create a look. You can have the scarf 'inside'. The scarf can be of lesser weight than the faux fur and the scarf can be worn swinging down both side of the neck, untied and unknotted. This is a look.
Remember that the tie and the scarf are suited towards a certain look in that they both accent and 'fill out' the neck and throat area. You can say perhaps that sometimes they 'clothe' these areas. Of course you can have a scarf that can accentuate an open throat area.
Ties are in a way tailored items. Maybe your look can include a skinny tie so that the role of the tie is not overbearing and not heavy and perhaps too 'tailored'. When you have a jacket and a shirt inside, a skinny tie may be a suitable feminine embellishment which adds sharpness to a look. The tie brings sharpness rather than masculinity to the overall feminine look you may have e.g. a drapy jacket or a faux fur jacket or any suitable waist-length jacket.
The scarf and tie are 'for' the gorge area. That is where they are made for. The knot of the tie is for this area despite the length and width of the tie itself being important also. And the way a scarf is worn around the neck and throat too seems to dictate the overall 'scarf 'look; A scarf worn loose, without loop or knot, gives a certain look. If a scarf has a loop, other looks may be created e.g. the college girl look perhaps.
So the tie and scarf are 'clothing' for the neck and throat area. You might disagree and say that if you wear a loose scarf, you may leave the throat area bare. However this still shows that the scarf seems to be some kind of clothing for the throat and neck area. For as the scarf is worn loose , it reveals the throat area...and the same perhaps for a tie. A skinny tie or an elastic, ready-made skinny tie may 'reveal' and 'open' up the throat area in some way.
Jewelery can adorn and sometimes 'cover' the neck and throat area. However ties and scarves don't just adorn, they cover and clothe and add 'extra' to a 'look' in a way that jewelery can't. Suitable patterns and color contrasts can be used. Some patterns are more suitable for skinny ties or skinny scarves and other patterns are suitable for heavier woolen scarves. A red scarf can sharpen a certain look e.g. faux fur jacket with t-shirt inside. For example, you are wearing a faux fur jacket with heavy lapel and maybe you are wearing a t-shirt inside. Then a certain kind of scarf will accentuate and give a little extra to this look.
A tie is associated with a collar which is why it may be suited to a fitted tailored look.However there are also cravats, certain light-weight fabric scarves, short knotted scarves and skinny ready-made ties. If you don't wear shirts with collars, then maybe a tie/scarf with your t-shirt or collarless blouse.-There is something possibly chic and sharp about a collarless shirt with tie. There is something chic too about light scarves contrasting with a heavy fabric jacket e.g. faux fur.
Silhouette creation may be your aim. You want to create a specific silhouette or a specific look. A slender silhouette inside an outer heavier silhouette may be your aim and the appropriate use of ties and scarves may do that.