What good excuse could I come up with

That would

a) allow me to purchase this AAAAAAAAAAAAA-DORABLE dress.

Source

and

b) wear it everyday for the rest of my life.

Techy, if you buy me this dress in a size 6, it will help me get the weight off faster.... I mean, seriously, that adorable collar. That poofy skirt. I might get mistaken for Mary Tyler Moore!