Tyler Robinson -- the 22-year-old who prosecutors say murdered Charlie Kirk -- just scored a small legal victory in court ... and it's all about optics.

The judge in his murder case just ruled in favor of Robinson's motion to wear street clothes at trial ... instead of appearing in jail garb. FBI

Robinson's lawyers argued jurors might potentially view him as guilty if they saw him in a jail jumpsuit.

He was denied a different motion to appear in court without handcuffs or restraints ... the judge rattled off a list of reasons why Robinson should be shackled for court appearances.

One thing both sides agreed on ... limits on video and photography inside the courtroom, which they said would protect Robinson's right to a fair trial. Play video content

Robinson was not in court

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