they do so because it makes them feel good about their self....

example Dolly Parton (a famous country music singer/writer/ actress) who is known for her big body parts, big hair, lots and lots of make up and lots and lots of "accessories" She grew up in poverty, didnt even have the clothes needed so her mother made her a special coat of many colors. in many interviews and in her recent autobiographical movies she says the reason she loves everything to do with wigs, make up, and accessories is because when she was growing up she saw a woman wearing these things and felt that were the most prettiest things there were and wanted others to see her as pretty as that lady was. She knew she was pretty on the inside but felt outside she was not. she wanted the outside to reflect what was inside.

another reason people wear all that in your post is health reasons. some people have health reasons that they need to cover up or take care of... allopecia for example is where someone can not medically grow hair on their bodies so they draw the hair on, they wear wigs and make up to take the place of what they do not have.

some people wear allt hat because its part of their employment or a disguise for after their employment so that they wont be recognized out in public.

my point there are as many reasons as there are people doing it I guess.

one time my therapist was wearing make up, wig and false eyelashes. I asked her why she was doing that.... she said why are you wearing that shirt, why are you wearing those pants,, why do you like eating strawberries, why do you like the music you listen to, why do you watch the movies you watch....... she went on naming all these things she knew that I liked to do and wear and listen to.

her point for some people its not a necessity its just their own preferences of what they like, just like I love certain clothing, food, music, movies.....

my suggestion is maybe look at why you love what you do and maybe those in your life who do this can answer your question of why they do it.