Is it nesscary for female travellers to Botswana to wear long shorts/skirts and modest clothing?

I am going on a Habitat for Humanity trip to Botswana, we will be working in rural areas building houses with local people,

play safe and wear a long short/skirt

Bon Ton Skiwear Photo Mugs

For Chamonix sensible yet stylish clothing includes gaiters a [...]