For cooler weather, you can pair leggings or joggers with a moisture-wicking long-sleeve shirt or a Disney crewneck sweatshirt
The USMC Female Enlisted Blue Dress Uniform comes in four variations alphabetically designated as A through D, with the C and D versions replacing the Dress Coat with a long- and short-sleeved khaki overblouses, respectively
Things to avoid for this: Button-down shirts (too casual), mismatched leathers, and pretty much anything that's not the timeless business options listed above
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In hot or humid climates, sleeveless dresses are perfectly okay, though you may want to bring a cardigan to ensure you're dressed appropriately if you're visiting a church, temple, or synagogue