Do you think I can combine the fabric garments of the latter photos with the early traditional shields?
Most definitely. The caravan routes passed through Ugogo, and the Wagogo had been extorting cloth from passing traders since at least the 1850s (the guy in the first Gogo pic I posted is wearing a cloth skirt):
The fellow on the left in the above picture is also Gogo, and his dress is representative of the earlier period. Curiously though, the source pic comes from the 1890s, which shows that if you want you could mix the traditional dress and shield in with figures who have adopted Masai styles like the ones in Inkydave's pic, or the fellow below, who is sporting yet another different Wagogo look:
Note the various
Sigue Sigue Sputnik hairstyles on display.