Go slowly, and stop worrying? Maybe have something else you could wear if you’ve already got an outfit? It’s easier to keep weight off, in my experience, if it’s happened because eating habits and portion sizes have changed. A non T1 friend who has real difficulty losing weight has just discovered the Exeter Uni training responses to food programme and it’s working for her, but then she doesn’t have to juggle insulin doses and metformin so I don’t know if it’d be good for you.