The temperature will be in the 30s or 40s, and windy. Forget about bringing shorts and flip-flops--it will be too cold for them. You ll want long pants and a heavy coat plus gloves. The teenage girls tend to wear Ugg boots, which are warm and pretty comfortable.As for what to wear while actually at the Pentagon, your chorus director should tell you what the outfit will be. In general, performances in Washington tend to be more formal, like wearing white shirts and dark pants.
Well the pentagon is usually very formal so nice clothes is a must, it does get quite cold in December but it doesn t tend to snow, so just bring what your comfortable in and also back-ups in case it does get cold.
The pentagon usually requires more formal dress. It s usually quite cold in december, but snow is rare... if you re going to be walking around the city, sightseeing, etc. then sneakers are a must.