Lucy, I think your problem is that you have the wrong inches for your height.

5 feet = 60 inches and 5 feet is not tall. You said you are tall.

If you are 5 feet, 8 inches tall, then you would be 68 inches not 58 inches.

I am 5 feet 8.5 inches and I am 58 years old, so I will come up with a larger size than you.

If you were 58 inches, you would be less than 5 feet and at 188, you would probably wear a size 20.

Calculate again and see if you don't come out closer.

Carol