Guy intentionally avoids you when you dress up? Please answer?

This dude has been showing signs of attraction and interest. I usually always dress down but the only day I dress up in a sundress and hat he pretends I don’t exist? He came around some moments but not like how he usually is.. he’s usually always looking and smiling. It was the opposite

does this mean he really wasn’t interested or he thinks I’m trying to get his attention and wants to avoid me? It was so weird

I think he may of just started talking to someone but it’s not official

Guy intentionally avoids you when you dress up? Please answer?
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