Adding a waistcoat to a suit...

Odd waistcoats are a tricky look to pull off OP. Your best bet is to get a three piece suit to begin with but if you haven't, as B&C said do not under any circumstance try to wear one in the same colour of the suit.

Just throwing this out there also - it would be much easier to layer a very thin merino v neck jumper under the suit for a similar, but much easier to pull off look. Two colours to start with would be a pale grey (if you wear navy suits) and maybe a light to mid green. Navy would be very nice if you wear mostly grey suits but don't try to wear a navy jumper with a navy suit.



One caveat - go a very fine wool like merino or if you can afford it, cashmere. Cotton jumpers have a place in a mans wardrobe but only as casual spring/summer wear.

In my old job i used to always wear a 3 piece and always had the waistcoat not matching the suit and i always used to go for wild coulors like i had a dark grey with a navy suit. A plan grey with a tartan style suit and so on.

All depends then on there shirt your wherein under it i used to love pokeadot shirts then a good tie.

I am very bold with what i wear and the amount of compliments i used to get for my suits was suits as i stood out big time. People stopped me on the sts asking me where did i get the suit ?. I made river island or asos clearance look like it cost 10 times that as i got everything fitted after i bought it.

Now i wear jeans, and a jumper in work and bold jumpers again and get compliment for my work wair again. I am going to be in a office with a few 100s other people might as well stand out.