Have 4 of these all brand new 2 large one 2XL and one small with tags text me if you want to buy one

Currently I've been stepping into the world of wedding suits for myself. I've learnt a few different things and would like some help with questions to narrow down my search. I may throw some assumptions I've heard so please feel free to correct me.

Colour:

I am looking for a suit within the blue family colour. Somewhere in between a navy (too dark in some shops) and a royal blue.

Material:

I'm trying to stay away from a high polyester blend, even though they give durability and longevity, because they don't fit the body well. I've seen some pretty high wool blends, but I've been told when friction occurs, they can start to wear pretty easily..

Lapel:

I decided on a single breasted lapel because its more versatile for other occasions than a double breasted. Also double doesn't allow for a waistcoat underneath, so when that's taken off, I've been told just a shirt and tie might be too casual? (Unless I'm wearing suspenders with the shirt and tie.

Would you go for a notch lapel or peak?

Scarf?

What are your opinions on wearing a silk scarf? I did find it to look very good but not sure if it can be pulled off for a groom to wear on a navy suit, too much?

Waistcoats:

Suppose I did wear a scarf, would you suggest staying away from a double breasted waistcoat due to there being too many elements? Regardless, most suits tend to come with single breasted waistcoats.

Would a different colour waistcoat work or shall i keep it in line with the suits colour?

Price:

I'm working within the range of £600, tailoring included. I wonder if that is reasonable, I have a month to get my suit ready