The pair of trousers that I am currently working out started out as my husbands but they magically shrunk while I was working on them! I gues I messed up the measurement or forgot that I needed to add seam allowances. I'd better check what the problem is before I start working on the next pair! Both my men wanted a pair of striped trousers, because for them that is what belongs with a victorian suit. I thought it was worth checking if historically speaking that was true. Looking at what I found plain or plaid trousers were more in favour but there striped pants were worn as well.
1820's cossack trousers,
ça. 1840, The Met
1848 fashion plate
Left pin stripes, middle wider stripes.
Il Gionale dei Sarti September 1850
1880's, RISD Museum
Fashion plate from Sartorial Arts Journal, 1891,
Gladys Marcus Library, FIT
c. 1900 white cotton & blue pinstripe trousers
Althoug I only did a very superficial on the matter I did feel that after the 1860's examples became easier to find. Maybe they became more fashionable?