Given the range of temperature inside the island, you should take along some hot clothing in addition to the usual light and ventilated ones necessary to your comfort under these latitudes.
Sport shoes such as jogging or tennis are necessary to travel the length and breadth of the current Malagasy paths. A pair of light sandals is an essential extra for the comfort of your feet. A hat and a pair of sunglasses are quite important accessories. If you do not want to burden yourself with them, the local production is largely varied and within everybody's means.