Because I feel I'm too thin, my skin is so dull and I feel more comfortable with my clothes protecting my body.
Anyway I read your reply when I've already been busy at my first service. We gathered at 8 am, when it was a bit cold and cloudy. At the beginning, everybody were there with their full uniforms and distributing flyers and speaking with people was our only job. Later, around 11 am, it turned to be sunny and temperature was nice. Many volunteers started taking off the upper part of their uniforms and in a few minutes many jackets and sweaters were left on the chairs.
They also offered me to get a post-it note with my name written on it to replace mine, but I prefered to keep my uniform which includes its proper plate on my jacket.
I was keeping it all zipped up to my neck and my hood was up as well. Soon after some groups of kids arrived, accompanied by their parents. So we had to make them enjoy drawing with watercolors on our arms.
I was sitting on a chair when two little girls came to me and blamed that I was too much covered making them unable to draw on my skin. Their parents said them to "strip me", because I was the only one being packed up that way. They said that it was sunny, looked at my plate and said that "Evangeline doesn't need water-protection and thermal insulation". Then one of these little girls pulled down the strings of my hood and the two started to unbutton the press studs of my outerjacket. After that, the stormflap was still covering the front zipper of the jacket but the hermetic zipper was pulled down by those whirlwinds who finally untied the inner drawsting which was the last thing keeping my jacket tied on my body.
At that point my outerjacket was wide open, still trying to cover my arms but unable to protect me like before. I could see the fastening stripped down, on the two sides of my jacket, with its drawstring, zipper and press studs completely twisted and ripped apart.
They started drawing some butterflies on my neck and when no more skin was free, they easily managed to pull out my sleeves. No fastening was preventing it from happening and my outerjacket was taken off in seconds.
My sweater came off as well as those little girls pulled it out of my trunk and I was finally asked to roll over my polo shirt's sleeves, leaving my arms uncovered.

They also detached the velcro nameplate from my outerjacket and they sticked it on my polo with tape, so they said "You still have your plate, Evangeline!".
Meanwhile my sweater and my outerjacket were abandoned under the sun, and a young woman, which was the director on yesterday, retired our brand new outerjackets and told us that we will get them back later if and when cold weather will require them to be used.