I think what you will be wearing should do fine, day sporran and shoes matching in level of style is okay. Just from the sound of the combo (yellow tie, blue hose, red flashes), even though each might be present in the tartan of your kilt, still you might have a bit of a circus clown color scheme going so I would try it on and look in the mirror to see if it works in your own eye. If in doubt swap out the red flashes for the tartan ones and you should be great to go.

And like Chas says, if you are the only one kilted who is to critique you? Go proud and self assured. And have a blast.