At 70°F, about 21°C, a light top and loose cotton trousers are a useful starting point. With Macaron's personal AI, you can choose a light outfit from your own clothes and account for an air-conditioned room or a later trip home.

Try a light short-sleeve top with loose trousers and comfortable shoes. If you prefer more coverage, swap in a thin long-sleeve shirt. The clothes should feel comfortable before you add anything for a cooler part of the day. For a walk, think about how much time you will spend moving compared with sitting outside.
Compare the garments in your hands. A thick cotton top and a thin cotton shirt can feel quite different; a lining also changes the outfit.
Key points:
Color alone does not tell you whether a garment will be comfortable.

A thin cardigan or open shirt is useful only if you can carry it when you take it off. Put it in the bag you intend to use. If it takes up the whole bag, try a lighter piece or adjust the base outfit. For a day mainly indoors, choose the layer around how that room usually feels to you.
Keep the lighter base for the warm part of the day, then add the carried layer if you need it after dark. Update the plan when the forecast or activities change; Macaron works from the details you provide. A cooler start may need the 60 to 65°F layering approach. If you are packing for several warm days, a summer travel capsule can help you reuse the same light pieces without carrying a separate outfit for every temperature.
It can be comfortable in a dress, depending on the fabric and your plans. Keep a light layer available if you tend to feel cold indoors.
Choose for your walking route, workplace rules, and comfort. The temperature alone does not decide which footwear is suitable.
Color is only one part of how a garment feels. Check its weight, lining, fit, and whether you enjoy wearing it in similar conditions.
Possibly not. Pick something easy to carry when you take it off.