Sentence 1: Julie took three pairs of size 12 pants into the fitting room. 
 Sentence 3: She was delighted, thinking her new diet was working 
 Sentence 4:  Then she realized she had grabbed size 14s by accident 
 Sentence 5:  She felt very disappointed 
 Option 1: The first pair she tried on was way too tight. 
 Option 2: The first pair she tried on were way too big.