In a dry wilderness, antiperspirant isn't necessary. In an arid place, a still suit, which is cooler than a wet suit, is indispensable.
Stillsuit= body-enclosing garment invented on Arrakis. Its fabric is a micro-sandwich performing functions of heat dissipation and filter for bodily wastes. Reclaimed moisture is made available by tube from catchpockets.
Source: Terminology of the Imperium, Frank Herbert's Dune