All depends where you are working,
Northsea in winter bring plenty warm cloths, t-shirts, thicksocks etc etc
Afirka, light clothing, t-shirts shorts flipflops, nothing fancey as it will likey get stolen. I brough 6 pairs of socks and underwear last trip and down to one pair of each and the end as all went missing in the wash or stolen!!Joys of Afrika, TIA as they say.