It's rude to lie to your girlfriend.
Mary bought a poorly fitting outfit from the store to wear for work and wants to know what her boyfriend Tom thinks of it.
Tom wants to give feedback on the outfit.
Tom tells Mary that the outfit doesn't fit her body.
Tom tells Mary that the outfit looks great on her.
Mary takes the outfit back to the store and gets one that fits.
Mary wears the outfit to work and gets laughed at by her co-workers.