Someone is trying to sue a store over having a stated “dress code” for customers? Are they arguing that being immodestly dressed is a requirement of a certain religious group?
Unless the store is funded by the government, the case will lose. If they sue in Federal court, the plaintiff will have to prove at least some theoretical basis for thinking the suit might be valid or the lawyer will get fined.
The “penalty” for a store turning away customers is loss of the customers’ patronage.
Perhaps some group is trying to “shake down” a store owner?