Is a defendant's appearance in court relevant to his or her credibility?

demeanor is always relevant to his or her credibility. (People v. Lopez (2013) 56 Cal.4th 1028, 1064.) While relevance is a prerequisite for admissibility under section 350, however, section 352 gives a trial court discretion to exclude relevant evidence "if its probative value is substantially outweighed by the probability that its admission will (a) necessitate undue consumption of time or (b) create substantial danger of undue prejudice, of confusing the issues, or of misleading the jury." (See People v. Gonzalez (2006) 38 Cal.4th 932, 950.)

In a similar vein,

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