For a tested relaxed casual option, you can't go wrong with this pairing of a cardigan and a light blue denim shirt. Introduce a pair of tobacco leather knee high boots to the equation and you're all done and looking spectacular.
Light Blue Denim Shirt with Cardigan Warm Weather Outfits For Women
Consider pairing a cardigan with a light blue denim shirt for a straightforward look that's also put together nicely. Black leather over the knee boots look amazing rounding off your look.