I usually say (in all past jobs, at target and now) "What if we try xyz, in xyz order to see if it makes a difference." This way you are giving your opinion on how something may improve a condition yet not challenging the bosses and sort of keeping it open ended where they may be able to get the credit for it if it works out well, or praise you if they are so inclined. They can also blame you if it flubs, but since you took the initiative to pose the suggestion, you should be strong enough to accept the blame..
Target was the only place where I got resistance on anything I offered. The managers I had were all to afraid to implement anything new that didn't come from corporate. And believe me, the things I offered were minor, just ways to improve some departments to run smother and have communication. in and beyond the particular department.
One of my biggest complains about Target (besides GSTL from hell) was that one hand didn't know what the other hand was doing. Without that, there is no team. Without a team, it's every man for himself and that is no way to run a company.