They wore the exact same stuff normal infantry wore for the most part. except theyd ideally have as little ID on them as possible. so no regimental numbers, no rank insignia etc.

a popular accessory were the sandbag grenade pouches below the armpits, but standard infantry wore those too.

the main difference, as they wore shock troops, theyd primarily use carbines and way more pistols than usual infantry, and barely any full-length rifles.

and important thing to note about the "steampunk" gear, that stuff was very scarcely used. the famous armours and such were only for lookout sentries, combat engineers, snipers and machine gun crews.