L. Horatia Adamas C. Florio Lupo L. Metillio Nigro omnibusque S.P.D.
The actual tunica (not the diagram) pictured below is reasonably accurate, but the angusti clavi should be moved outward. I have seen surviving examples of Egyptian period tunicae angusticlaviae in which the stripes (in green) are offset further. It would not surprise me if this were done so that the toga did not conceal these important marks of rank. Overall, the tunica could be either in the 'pillowcase' shape of the fabric tunica, or the T-shape of the diagrams and the Egyptian ones in the Metropolitan Museum (NYC) which I viewed some years ago. During the classical period, the men's tunica was girt so that it did not fall below the knees, and was 'cut' (not literally) so that the sleeves (whether or not T-form) did not extend below the elbows. Later on those provisions were altered, even ignored.
There is some question about the position of the latus clavus as to whether there was one centered stripe or two over the shoulders, but my sources seem to indicate a single centered stripe, and none on the hemline or sleeve edges, ever. Surely the golden borders on the stripes in one photographic image (Pompey) are inaccurate.
The subarmalis is a short overtunic which is worn between the lorica and the tunica. It is intended to prevent damage to the tunica itself from the lorica, whether by staining or tearing. Probably one did not wear one's best tunica in battle…
I don't know of any difference between ordinary senatorial garb and that of magistrates, and I have done a fair bit of research into ancient clothing and own some major works on the subject.
As for the toga, the opinion of Léon Heuzey, a noted French archaeologist after whom a street has been named (à Paris, peut-être) and many other scholars, the Republican period toga was close to semicircular in form, and worn single ply. In the Imperial period, it was worn mostly, but not completely, doubled over and was considerably larger, plus was almost circular in form. There was no border on the straight edge. None. That was a characteristic of the Etruscan predecessor of the toga, shown in the famous sculpture of the Arringatore, which has the border only on the straight edge, not the curved one, whereas the classical Roman toga had the border solely on the curved edge, none on the straight one.
There seems to be a lot of misinformation on this subject abroad, among Roman enthusiasts and even among authors on the topic. Some like to follow the opinion of Lillian Wilson, who believes that the Republican toga was shaped like a trapezoid atop a shallow bowl (as apparently in the large diagram below), but many prefer the much simpler solution given by Heuzey, the Archaeological Institute of America, and others. The simplest solution often is the best one.
Obiter, Lupe, I seem to recall that the equites wore the trabea...