Lose weight or buy bigger clothes?

I think I would prefer to lose weight.
I tried on some clothes in stores in the past few days and that was horribly depressing.
So, I am trying again to lose weight.
Yesterday I survived the "fast" day on the 5:2 diet if I did it right.
Pants size 10 are tight.
I want to get back to wearing sizes 6 and 8.
I am recording what I eat to see if that helps.
Really.
Gonna do it this time.