Long-sleeved shirts and trousers: temperatures can drop at night and it keeps mosquitoes away and protects you from the sun.
Shorts
T-shirts
Rain jacket
Fleece jacket/ warm sweater
Socks
Hat: to protect your face from the sun
Nice outfit: for dinners or when you spend time in a city
Sarong: very useful for women to wrap around if you need to go to the toilet in the bush or after a swim.
Swimsuit
Sunglasses
Daypack: a small one that you can take with you on daily tips the best thing is to wear layers of light breathable clothes. Mornings and evenings can be quite cool in Tanzania while during the day it can become pretty hot. Choose neutral colors to keep the bugs away and don’t scare off the wildlife.

A pair of sneakers or trail runners: hiking shoes are only necessary if you are going to climb a mountain, otherwise, choose lighter shoes.
Flip-flops or sandals: comfortable when you relax at your accommodation, go swimming or take a shower.

Pack the usual things like soap, toothpaste, shampoo, and conditioner, etc.
Sunscreen
After-sun lotion
Bug spray/ insect repellent with DEET
Lip balm with SFP
Wet wipes: if you have to go to the toilet or clean anything during your safari.

Camera
Charger or/and batteries
Extra memory card
Headlamp/flashlight
Phone: a lot of accommodations offer free WIFI
Universal plug converters
Binocular