Ever-changing uniform requirements can be frustrating. Just when you get your sea bag set, the U.S. Navy unveils a new or updated uniform to add to the list. In fact, there are more than a dozen changes in the works right now — an improved fire-retardant coverall, moisture-wicking warm-up suits, service dress blue jumpers, lightweight pairs of the Navy working uniform, a cold-weather parka, just to name a few. The U.S. Navy isn’t the only one doing this. The Royal Navy has unveiled its new working uniform, which will replace the duds they’ve worn since World War II. Now that’s old school!…