In order to not arrive at your destination looking like a hot sweaty mess, it’s best to find comfortable clothing that will help wick away moisture and keep you cool for your journey. Although the most important factor is whether you can move enough and aren’t restricted whilst riding.
Most products that are made for running also work really well for cycling in. Smartwool make some great Merino baselayer tops which have been designed with style and performance in mind.
Baselayers are great at keeping you cool on warm days but still keep the chill away when needed. A great tip is to buy it in a larger size and wear it as a baggy t -shirt, paired with some commuter cycling jeans for a more casual look.