Suit looks like this
Occasion is for a wedding although I am not part of the groom party.
I was thinking a red or light blue tie on a white or white-on-white striped shirt?
Might go for this shirt http://www.houseoffraser.co.uk/Double+TWO+Cotton+rich+formal+shirt/182387641,default,pd.html
And I like the blue tie here http://www.houseoffraser.co.uk/Linea+Ribbed+silk+tie/147060856,default,pd.html however the shape looks odd at the bottom and quite wide at the top/middle. In fact, the lilac colour option looks to be a thinner tie entirely.
I'd prefer a shape like this, but I think the colour is too dark http://www.houseoffraser.co.uk/Skopes+TA0960+tie/121215522,default,pd.html
Well, I'd assume the ties are the same shape, and the difference is in the photos.
If you're really fond of the white-on-white stripe, then go for it. I had one, but I never liked it. I wound up having the fire alarm go off in my building one day as I finished my laundry, so I went out into the cold with a basket full of shirts right out of the dryer. I wound up giving my white-on-white stripe to a girl who was shivering in a tank top. Admittedly, it was bought second-hand for a dollar, and I never liked the collar, but I haven't missed it. I always found it a little flashy for the way I like to dress.
The ties are fine in terms of color, but I'm not sure if the material will be very nice. If it's what you can afford (I buy my ties in thrift stores, but it takes a long time to build up a wardrobe that way) then it'll serve well, but you could consider a nicer one. If you go for a nice, solid navy, then you'll get a lot of wear out of it.
Of course. Everybody notices your tie.
I've seen cheap ties that looked alright, and cheap ties that looked pretty awful. It's hard to judge which camp that one falls into based on those pictures. If it looks good, then it's fine. If it looks cheap, then you might find yourself wishing you'd sprung for a (slightly) nicer one.
Matching tie and handkerchief, or a pindot tie with white handkerchief? The first is not so good, the second pretty great.