It depends on three factors:
A. Your skin's age. Do you have wrinkles and tears?
B. Your excersize. If you didn't lose something staggering excersize can fix small skin looseness. Again it has to do with point A though.
C. The fat concentration. Were you equally fat on the whole body? or did you have a huge "something". If so you might get skin loose there.
Of course this is simplified.