Thanks Gailforce although LR is beginning to be a distant memory!
We had a palomino LR when DD was little and what Baldrickswife said is correct. Go for a tweed jacket - ideally to compliment your DD's outfit - with a blue culottes or flowing skirt (the former are easier to run in) and a hat. Choice of boots/shoes and hat depend on the weather. You can't go wrong in Dubarry type boots and a wintery hat is preferable to a summer one with a M&M unless it's really hot. Try to avoid leading in your own riding gear unless timing is too tight. Some people do pop their culottes over their own jods..
Whilst we use a white girth on our bay show pony we've always used a brown girth on our palomino M&Ms (see photo) - seems more workmanlike.
Don't forget that M&Ms are not plaited which makes them such a popular choice!
Don't forget you'll need a plain brown show cane and a leather lead rein (never a rope one) which you attach to the noseband.
Ideally you'll have the cane and the end of the lead rein in your left hand which leaves your right hand free to balance your jockey if required. Of course ideally your jockey will be able to ride the pony independently - this gives the best impression because then they are steering it rather than you.
Children these days can use a strap but we never did because they discourage children from having independent hands and makes it a harder transition to first riddens.
One of the most important aspects is to try and make sure the pony will go on the bit with little effort from your jockey. Work on this at home - use side reins or get a teenager to school it if necessary.
Practise both parts of your show. In the trot round make sure you wait until the judge is ready to watch you and then do a smart trot and a positive (short) walk to halt. After making sure your pony is standing square count 1-2-3 with your DD and then salute together.
In your individual show work out a routine with your DD in advance. A basic figure 8 will be fine but she should know when you're going to trot and make sure she's balanced before you set off on your first turn. Make sure your DD knows how to get the right diagonal. Getting your pony listening to voice commands will make the job easier.
Let me know if you've any other questions and very best of luck for a fun time !!