Without any obvious reasons HE changes his outer appearence

Many guys do not take good care of their personal hygiene. If some time ago you spent quite some time to teach your husband to take a shower once a day, but recently he does so every morning and evening, pretending to have a beer with his friends, take this into account. Also you have to mind if he rapidly change his clothes, style, parfum or so on without your opinion, which previously meant something for him.