Is it okay to let kids wear shoes that are one size too big for them?

I tried buying one sized bigger sandals for my child when he was younger and when i finally realised why my child was dragging his feet all the time when he was walking, it has became too late as it has formed a habit which takes me lots of nagging to stop the habit... i do feel regret for buying sandals too big... if is sports shoes, i think should be ok for bigger size... hope this helps... :)