I told my wife about this post and she said that her District Scouters would never hesitate to call her superiors to let them know that she was out of uniform. Many volunteers (even those who wear half uniform) would find it almost offensive that the DE was showing up at functions in only half of a uniform not to mention to District meetings. The only District Meeting that allows for a professional or any volunteer to be out of uniform is the District Committee meeting because non-scouters can be present on DC. Even then, she is careful to dress in professional attire.
She also said that it depends on the Council that this DE works for. in our Council they are very stringent about how you look, what your uniform looks like, if you uniform falls with in the insinia guide, etc etc. Outward perception is everything and pride in the uniform and the organization that you work for is most important.