Kilimanjaro Preparation - Clothing Bottom

Planning for Kili and having looked at several gear lists, I came up with the following combination for bottom layering:

1) patagonia briefs - 3 pair
2) smartwool midweight base layer
3) alpine designs fleece pants (clearance at Gart)
4) rei mistral schoeller pants
4a) black diamond "hex" belt (clearance gearexpress)
5) montbell waterproof pants (clearance at mountainworks provo)

I also have a pair of montbell puffy pants that I might take (clearance on the montbell website).

for feet:

3 pair silver thread liner socks
3 pair REI expedition wool socks
1 pair vasgue trail runners (clearance rei)
1 pair scarpa charmoz boot

luxury item: fleece socks for camp/sleeping