Thank you very much for your effort! Have you read this book? If not, it's highly recommended... and not by my humble self only.I've added some new articles. Please let me know if I'm missing things or getting things wrong.
There are certain details that should be corrected. For example,
I can only think of 3.5 people who were crucified and whose names we know. (Please tell me in the comments if you can think of more.) One-and-a-half of them are women. (I’ll explain.) Jesus Christ is the most famous, of course, followed by Spartacus.
Cook has a few more names, but not Spartacus, who according to all ancient sources was killed in action during the last battle of the servile war. There's always a question of where to draw a line -- was Laureolus, who 'hanging on no false cross, gave up his defenceless entrails to a Scottish bear' (Martial), crucified or given to the beasts?
In any case, it is unlikely anyone on their way to be crucified anywhere outside of Judea wore clothes.
Unlikely (and certainly not an idea I like ) but not improbable. The ass-headed cruciarius in the Palatine graffito wears a kind of short tunic. For what it's worth, the Emperor Hadrian forbade the executioners to profit from the rags of the condemned.