I haven't been to ON in awhile (and to me, their clothes are a hit or miss). I just got an email for 30% off (code JULY2012) and am thinking of getting a few maxi dresses. I remember looking at their jersey tank maxi dresses awhile ago and thinking the fabric seemed cheap and thin, but I can't say for 100% sure.
How is the quality? Should I get it? They're only ~$25 after the discount, but if they're too cheap/thin/not quality, I'd rather save my $ and just spend it at BR.
I actually just received the teal one you are looking at, but in black. The material actually isn't bad and the dress seems pretty comfortable. I am 5'8 and it hits at my ankle. I haven't had a chance to wear it yet, so I cannot comment on wrinkles, it seems like it should be fine though. I got mine for 35% off, so for $22 it seems totally worth it.