Jordan 1 sizing .5 from tts

Hey yall i was wondering if i can go half a size up from my tts. ima 9 in tts, but for jordan 1s i can fit into an 8.5 without it hurting my feet. Would a 9.5 be too big for my feet? I have narrowish feet so i guess thats why i can fit in an 8.5. Thanks!!

Ask in here http://niketalk.com/t/508567/official-air-jordan-1-retro-high-thread-vol-best-model-thread