Well, I can say I see two sides here.
1= If you are/were put into a strairjacket unwillingly or even convinced into one for real use, to keep you contained or to settle you down, that the experiance would most likely not be any sorta fun and most likely never want a repeat.
2= If you got into one with a friend/so/caregiver you'd be in a different state of mind and being cared for and might enjoy the lack of control and the physical compression of the straitjacket.
I have had experiance with my ex and a straitjacket many times, and it can be a fun and/or relaxing experiance in the right setting, especially if you trust them, which i say is a must.
That said, getting out of a strait jacket is possible depending mostly on the straitjacket and/or the application of it. If you have a "real" straitjacket (medical(posey etc.) or not(MaxCita etc.)), and the straps are done upproperly, you wont likely be getting out of it. A proper one has crotch straps to keep it coing up, arm loops to keep arms from going over head, small arm holes and not any strech.
They are available in many "Play" types as well, being not built well and also even gimmicked for escape artists.
That said, like handcuffs, or any other restraint the setting/use will make the whole ordeal good or bad. I'd assume that being handcuffed and hauled into jail isnt fun, but being handcuffed and hauled into the bedroom easily can be. Same device different use and setting.
That also said, as always be careful and do with someone you trust for sure. Even so far as if there is ANY reservation in trust to either not do it or at minimum schedule somone to checkup on you. Be safe!