Since I am a shopper (friends say I am good for the economy) I will enable you just a bit… I agree with the RJ coats are nicely cut and reasonably priced. I would get one in navy.
CO helmets are beautiful and many people still wear them. I look at helmets as an investment. I ride in my show helmet and boots. If I didn’t I don’t think I would ever get to use them. So maybe the place to splurge on what you really want and fits nice on your head is a helmet. Certain helmets don’t fit me very well - I cannot wear GPAs and most of the Samshields don’t fit me. I did end up buying a Samshield because I liked the replaceable liner… it has been putting pressure on my forehead and I am thinking to go try another liner… nice option. (I just read you ordered the CO - good choice!! I really love mine)
If you already have beige breeches and a white ratcatcher then your all set.
You did say it’s a schooling show so you will be fine.
I have riding clothes too that should be collecting Social Security… I do try to wear them at times but you know, they just are not cut as well and not as comfortable as what is available today.
So get comfy and have fun!!!