Why did the narrator find the behavior of the woman standing outside the Regnier's strange?

This question is from The Case of the Sharp-Eyed Jeweller by Nicolas Bentley.

Think that not my text

The narrator observed the bevahiour of young lady a bit strange.she was looking like she is from Rich family because her cloths were of brand,but the cloths were not in good condition.and she was continuesly starting at the jewellery kept in shop.so William Morris keep on observing her bevahiour