Converting flapped pockets to jetted

I would suggest simply tucking the flaps into the pockets.

An experienced tailor will be able to do this but I suggest you just find another jacket because here is a high chance that it will not look right

In addition to simply just tucking them in, assuming the pockets are jetted with flaps in the first place, you would need to have them closed with some sort of hand zig zag stitch to close the gap. The stitch should be easy to remove afterwards should you wish to go back to flap pockets.

Why on earth does such knowledge matter to you? This has been done for years by those who prefer the non-flap look.

You may need therapy.

don't we all need that more or less...anyway, just tuck them in or see a good alterations tailor and ask for a quote

If wants to convert them to jetted I don't see why stitching the pocket closed would be necessary, just tucking the flaps in should be enough. I don't see what stitching them shut would achieve other than preventing you from using the pockets.

Are you having the pockets stitched shut? If so, remove the flaps, rather than tucking them and closing the pocket. I had this done on a couple suits, and the outline of the tucked flap will show after a pressing.

tuck them in and have the flaps stitched in. That is what I had done on my tux.

That way I can still use the pockets for the valet ticket and not have to worry about one of the flaps coming out unknowingly.

Stitching the pocket closed is not necessary. It will just prevent the flap from slipping out. Personally I'm not a fan of opening up jetted pocket to be used in the first place because I don't like the look of the pocket opening after it has been stretched due to use. Flaps usually cover any gaping pockets, but since the flap is gone (or tucked in as would be the case here) I think it would look nicer closed by hidden stitching. If I have anything that needs to go in a pocket (wallet, phone, tickets, etc.) I tend to use the pockets in the lining anyways. This is only one suggestion, and it would depend on whether or not the OP wants to hang onto the flaps just in case he changes his mind in the future.

There is a difference how flapped and besom pockets are finished. On besom pockets a piece of cloth is sewn inside as a sort of facing so when the pocket opens you see the same cloth as the jacket. On a flapped pocket there is no cloth under the flap, only lining. This is to reduce layers at the pocket. Converting from flaps to besom can be done just the same as it would have been done originally by removing the back lining of the flap and stitching the cloth to the inside of the pocket. It will be just the same as it would have been done the first time the pocket was made.

Don't try to remove the flap yourself, you will separate the pipe from the jacket.

If you like everything else about this tux, the flaps are no reason to pass on this one. Easy enough to change without compromising anything about the construction of the jacket.