[genericuser]

Wearing a suit to job interviews that you would be doing with 7 years of experience working at a defense contractor is definitely a good idea, assuming you had a favorable experience at the defense contractor and were looking for something similar.

People that did not expect you to wear a suit will be fine with it because they will understand after that long in that formal of a workplace it is reasonable that you expect yourself to wear a suit to interviews and other formal meetings. (If they don't then they would likely be a poor 'culture' fit, once again assuming you liked your previous environment)

People that did expect you to wear a suit, are much less likely to hire if you if you don't.