Of course, it's only a person's inner values that really matter, but let's be honest: we see the outside first. Naturally, we form an initial judgement based on that. If someone appears very unkempt or completely inappropriate, that can also be devastating... If you get to know each other better anyway, I think these prejudices disappear again.
Of course, this is not even the matter of being judgmental.
Trying to adjust yourself for your partner should be considered too
No! Not for the partner. For oneself.