I usually forget silly things like hair mousse, toothbrushes....easy things to replace. DH, on the other hand, forgets things ALL the time. On trips he's forgotten a dress shirt (trip to Saks), shoes (trip to Lord & Taylor)...bathing suit (well, at least this he could buy in the hotel shop)....the WORST was when he forgot to pack underwear in the large suitcase. We were going on a cruise from New Orleans and were staying in NO for the weekend before, so packed a smaller suitcase for that part of the trip and left the large suitcase untouched....you GOT it.....the man had two pairs of underwear for the entire trip.
He is a small man (28 inch waist) so the ship didn't have any his size...every port, there we were looking for baby underwear....Jamaica...Grand Cayman...Cozumel. Up seedy streets...down seedy streets! I wanted to buy him little boys boxers...but NO....nothing but the Calvins would do! In the meantime, back at the farm, I mean stateroom, there was his spare pair hanging in the shower like we were hillbillies or something!
I'd pack for the man but honestly I think he does this kind of thing just so he doesn't have to pack!!!