The red flag that stands out here is attempting to control what the other person is wearing. One person is trying to gain control in the relationship. 

The red flag here is an invasion of personal space. Rachel may be trying to control who or what the other person spends their time with.

The red flag here is one person trying to control their interests. If the relationship ends after he quits football, he'll be left with nothing. This is a way of controlling one's options.