When someone says "I put my jeans on backwards" it means that the butt of the jeans is forward, right?
Are there any other idiomatic or region specific ways to express the same meaning?
How would one say if he put his jeans on like this:

I googled for answers and found two funny expressions: arsy-versy and tospy-turvy, but I'm not sure whether these expressions are applicable here.
February 3 2013, 15:09:43 UTC 4 months ago
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February 3 2013, 15:17:37 UTC 4 months ago
If I put my jeans on with the zipper to the back and the seat to the front, I would say back to front, but if I heard "I put them on backwards" I would probably understand the same, although it would depend on context - If somebody said: " everyday I put my socks on and then my jeans, but today I did it backwards" I would understand that they put the jeans on before the socks, not that they put them on back to front.
February 3 2013, 15:24:38 UTC 4 months ago Edited: February 3 2013, 15:26:13 UTC
Topsy-turvy would be upside-down (impossible to do with trousers), and while "arsy-versy" isn't in my dialect I'd guess it would be back-to-front or in the reverse order, like "ass-backwards" (which is in my dialect) or the intentionally ass-backwards spoonerism, "bassackwards".
February 3 2013, 17:36:33 UTC 4 months ago
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February 3 2013, 16:17:55 UTC 4 months ago Edited: February 3 2013, 16:18:23 UTC
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February 3 2013, 16:37:36 UTC 4 months ago
As for your picture, I'd definitely call that inside-out.
February 3 2013, 17:40:44 UTC 4 months ago
February 3 2013, 18:17:38 UTC 4 months ago Edited: February 3 2013, 18:18:58 UTC
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February 5 2013, 00:42:25 UTC 4 months ago
Wanted to say that this is a frustration of mine in Spanish, both inside out and backwards for clothes is "al revés" (backwards, or opposite to how they should be). Perhaps other languages also do it, and the person who made the original statement speaks one of those languages, too?
February 5 2013, 04:54:00 UTC 4 months ago
February 9 2013, 02:21:58 UTC 4 months ago
2) I would say that he put his jeans on inside out...