Dayvewc here are your two T-shirt images, I tried it as you suggested:
'He Said Yes' in red and yellow with Mickey and 'I Said Yes' in red and yellow with piglet. I couldn't make my mind up whether I liked the colour of piglet with the red and yellow writing so I also created an 'I Said Yes in red and yellow with Mickey, and and 'I Said Yes' in pink and yellow with piglet. That way you can pick which you'd rather use
I also added a border around the edge as from what I've learnt on here when you print the image to go on the t-shirt it is easier to cut out if it has some kind of border
If there is anything you don't like or any alterations feel free to say. Also, if you have any other requests for your magical trip I'd be willing to try my hand at anything
And here are the 2 alternatives:
Don't forget, to get the full resolution image don't right click and 'save as'. Click on the image and it will take you to my photobucket, there will then be an option somewhere on the right hand side to download the image

I have created it at a size that I believe should fit most size t-shirts but if you discover you have a problem just let me know