Yes I always thought the same thing about the voice, they should have had him disguise it more to be believable. Had never thought about the clothes though - that’s a really good point!!!
Milland has one of those distinct voices that can’t be disguised, especially not to anybody that knew Jarvis Goodland. The same problem occurs in the dreadful Murder In Malibu. The raspy Brenda Vaccaro threatens her sister’s gigolo boyfriend while pretending to be the sister. But Vaccaro is another person whose voice is very distinct. The episode is so bad that it doesn’t matter.