On the subject of rentals -- I agree that this is an option for a lot of men. You can rent the kilt and the jacket separately from most places. Obviously you want to buy your own kilt. Many men want to buy their own kilt for their wedding, because they plan on wearing it to many occasions later on, but not necesarily formal occasions. So they buy the kilt, and rent the jacket. If you plan on wearing your kilt to lots of formal occasions, go ahead and buy the jacket, too. It will save you money in the long run.

Regarding the belt, you write:
14. kilt belt and buckle - strictly speaking maybe not with a Prince Charlie but the outfit may not look complete without it
If you wear a vest (and I see you have one listed) I strongly advise you not to wear the belt. Reason is that the vest is likely to cover half or more of your belt, and a bit of belt poking out from under your vest just looks goofy. :-) You very well may want to buy a belt and have it for those occasions when you are not wearing a vest, but for this occasion I say leave it off.

Regarding the kilt, you write:
9. kilt - 8 yards and handmade for good quality
And...
Q5: Does it matter if the kilt is 13 oz or 16 oz?
I will say first that it doesn't really matter if the kilt is 8 yards or not. I got married in a four-yard box pleated kilt. What matters is the quality of construction and material. You want it hand made, and you want it of good kilting weight wool.

In general the recommendation for an 8 yard kilt is good advice. This is because most all of your 8 yard kilts are going to be hand stitched, top quality items. Most of the 4 yard kilts you see offered today are machine stitched, and just not made with the same care and construction that goes into an 8 yard kilt. This is because they are being made as less-expensive "casual" kilts. But as I have said in another thread, the hallmark of a good kilt is that it is neither formal nor casual, but can be worn either way depending upon accessories. I wore a four-yard box pleated kilt to my wedding, hand made for me by Wanda McSwain, with semi-formal accessories, and looked great.

About kilt weight -- I always advise people to get the heaviest weight they can afford. A 10 oz weight cloth makes an ok 8 yard kilt. I wouldn't touch it for a 4 yard kilt. A 13 oz weight cloth makes an ok 4 yard kilt, and a perfectly fine 8 yard kilt. A 16 oz weight cloth makes a great kilt, of any kind. It's the premiere stuff. Of course, the heavier weights generaly cost a bit more, which is why I say get the heaviest weight you can afford.

Aye,
Matt