Just a couple more things based on your itinerary:
• The tailor I used last time was called "Boss" and had an orange sign. Just on the next street off Khao San. Thailand's big thing is silk, so go for silk shirts & suits that run about $180 and up (cheaper and you risk getting paper woven in).
• Travel with a backpack, but buy a garment bag for your suits on your return leg through BKK.
• Book your Koh Tao resort before you go. Most dive resorts provide free accommodation while you do your course. You'll also need to know when it runs so you can plan accordingly.
• Most importantly, buy a flexible plastic waterproof case (a cheap waterproof camera bag is good) so you can put your keys cash and cards in it and keep it in your board shorts pocket while you swim. It sucks to have to watch the beach while in the water.
You'll have a great time.
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