This has been going on for years:
WT 8-15-75:
Christian women are admonished to have well-arranged dress, to adorn themselves with modesty. This principle, of course, also applies to men in the congregation. In determining whether to wear a particular style, we can ask if the clothing or grooming reflects modesty, or whether it is immodest and proves embarrassing to others. Tight trousers tend to be immodest for a man, just as short or revealing dresses can be immodest for a woman. When a sister bends over or tries to seat herself modestly on the platform, does she have difficulty because of her short dress? Do we possibly, by what we wear or by our grooming, mislead others into thinking that we have loose morals or have a proud, militant attitude?