Stewardesses must wear pantyhose. This is required by the dress code. The colour of pantyhose is also declared by the contract. But I bet the “shinyness” is not there. This is something what flight attendants can choose.
And fortunately they choose shiny pantyhose! Isn’t that’s why some fetishists go to the airports from time to time, when the weather (or the country) is not pantyhose-skirt-friendly? ;-P
10 photos below.