Is the color royal blue or navy blue

It would be more similar to navy blue.

I am a full size 13/14. Will this suit fit me in a large or xlarge, and does it stretch a little?

I just received mine. I wear a 12 or 13 in pants, I'm about 5'5" tall and an xl (36DD bra size or a total measurement of about 44" in the bust) in tops. I got the XL and it fits well. The pants are a little long but I think with 2" heels they will be perfect. The bottom of the pants are wider than they appear in the product images which is a bit of a let down but luckily I own a sewing machine. For the price point the suit is very nice and the fit is true to the size chart they provide.

I am approximately 155 Lbs and 5ft. Trying to figure out what size would be suitable?

I’m 146 5’5 and got a Large and it fits perfectly

I am 5’5 160 and a 36DD what size Do you recommend

Similar to my wife your recommended size falls into one of the either/or sizing selections. Not knowing body type I would recommend going with the bigger size suggested on the measurements chart. The jacket will fit in the bust without issue if you choose the smaller recommended size. We found the pants fit to be true to size but there is not give in the waist. We selected the bigger size of the recommended chart and are happy we did. I believe if we went with the smaller size the pants would not fit.