Lockers in Changi Airport?
 

My girlfriend and I are going to Singapore for a friend's wedding, and then traveling for 2 weeks afterwards. We are hoping to leave a bag of our dressy clothes at the airport in Singapore for those two weeks, and then I would pick it up when I fly out two weeks later. We will be doing more adventurous traveling for those two weeks, and won't need our nice clothes, and don't want to destroy them either. I checked the Changi airport website, and couldn't find any info on long-term baggage storage. Just curious if anyone had any experience - I could see why security concerns might make long-term baggage storage a problem. Thanks!

i believe there are places to leave them and you probably can leave them for free at the hotel you intend to stay in..

Lockers in the transit areas both Termainls 1 and 2, I 'think' they are near the terminal transit train area but can't be certain, they might not be so big, but the left luggage ( i guess intended for larger items or longer periods ) also main airport area on the basement level of Terminal 1, in Terminal 2 arrival area, unless anything has changed.

I agree with the boss, if you are staying in Singapore first and then returning there ( pressuming using same hotel ) easiest is to leave with the Concierge/Porters,I doubt they would charge you anything, maybe just sign something that if you don't come back the can sell :)
Left luggage could mount up in costs over a few weeks.

Yes, they have a left luggage service at the airport. I haven't used the one there, but we've used them in many other airports and it's always been fine.

Lockers are for short-term storage - I can't remember the limit - maybe 24 hours. Left luggage is for longer term storage.