Jeana,
There are things you can buy called waist expanders but I'm sure if you're anyways handy (unlike me :-) ), you could make a version of them.
What it is is a glorified piece/ length (only about an inch or so between the button and the hole or as much as you need to 'expand' the trousers) of thick heavy elastic with a button hole on one end and a button on the other - the button goes into the button hole of your trousers and the button of your trousers goes into the button hole on the expander.
There are different kinds of these - some with pieces of material in the colour of the trousers, that goes inside the zipper so there's no 'flashing' :D.
I don't have a link right now but if you google them you will see what I mean. There are loads on ebay and also they are usually stocked in nursery shops for pregnant women.
Hope that helps
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