I've always felt that the black shirt works when his pants are black as well, like in the manga:
(https://i.gyazo.com/bfd7700c9a5e6f2bfe0089d89e26177f.png)
...though it's worth mentioning that, in full-color pieces, Monkey Punch tends to give him a blue shirt and pants:
(https://i.gyazo.com/bef0278b6634b108dbbb5ee92dd3dba8.png)
(https://i.gyazo.com/da0feb161866fe0a6ea33b2a00480a22.png)
On that note, I didn't realize until recently that there seemed to be a time where, (especially in the "San Francisco" and "Yap Land" story arcs) instead of the trademark sports jacket Lupin wears, Monkey Punch was drawing him in something that reminds me more of a safari jacket:
(https://i.gyazo.com/67e5f3d17801976973a240716d5f46d4.png)
(https://i.gyazo.com/0d1da982b58735b27200ade0d8b61f7e.png)
(https://i.gyazo.com/42ea82b9b7d4c3840d5cd28897988910.png)
Wonder if he though Lupin's traditional look was too outdated, and wanted to give him something more modern for the early 80s? Guess he changed his mind, because for the end of "Yap Land", and most of the finale, "Bad City", Lupin's back to his sports jacket (though the final chapter has him without a jacket or tie).