For something on the relaxed side, opt for this pairing of a navy long sleeve t-shirt and a mini skirt.
Navy Long Sleeve T-shirt with Mini Skirt Warm Weather Outfits In Their 30s
This pairing of a navy long sleeve t-shirt and a mini skirt is well-executed and yet it's laid-back and apt for anything. To give your overall look a sleeker vibe, why not add black leather knee high boots to the equation?