Keep it simple - Plain and Practical for your comfort
A difference between Uganda and other countries in Africa is the location - though located on the equator - Uganda is higher in elevation than most countries and more bio-diverse. There are the Savannahs as in other African Locations but there the Rainforests, Jungle, Mountains, Lakes and Rivers. The clothing that you bring should fit the activities that you participate in.
The appropriate clothing for women considering the variation, but you also want to ensure that everything you buy is culturally sensitive (but also weather appropriate) we have listed the things that we think are suitable. The main thing is to be comfortable and on the whole as long as you are sensible you are unlikely to offend. Just remember, again, as you may have seen in the packing list, Uganda is not a very conservative dressing style country, and peeps tend to mind their own business most of the time.
Generally, It is not culturally appropriate for women to show their thighs. So skirts/dresses below the knee, capris, or long pants are your best bet. On top it doesn't really matter how covered you are for the sake of modesty - you would mostly be considering protection from the sun :)
With long skirts - be careful that they are not too thick of material. Some skirts people bring are not nearly as ideal as you would imagine, because you can get really hot wearing them.
With long pants - consider if they drag/touch the ground. The red dirt will get on anything that it touches. So just be forewarned.
I would recommend a pair of chacos to wear around the compound or another sturdy walking sandal for daily use.
For gorilla trekking, be sure you have some good (and broken in) hiking boots. They don't call it Bwindi an impenetrable forest for nothing.
Also for gorilla trekking, long pants/trousers and tall socks that you can tuck your pants in to. This works totally great. Though some trackers get fancy hiking gear that includes some sort or sleeve type thing that goes over the pants from the knee to the shoe and prevents ants from getting in. Either way works. Breathable long sleeve button down shirts are ideal
Gorilla Tracking Safari Clothing (Bwindi Forest is considerably higher up, cooler in the mornings and often there is a mist)
Nearly the same would apply for Chimpanzee Tracking