For someone who has never worn a wetsuit, will either of these fit if I am 5'8" 155 lbs?

If you are a male you'll need a size 6 in an Orca. Here is Pro Motion's sizing chart for women's tri suits:

SIZE 4 6 8 10 12 14 16 18* Weight 100-115 110-125 120-135 130-145 140-155 155-170 170-185 185-200 Height 5'-5'3" 5'2"-5'5" 5'3"-5'6" 5'5"-5'8" 5'6"-5'9" 5'8"-5'11" 5'9"-6' 5'9"-6' Chest 30"-33" 31"-34" 33"-36" 34"-37" 36"-39" 38"-41" 40"-43" 42"-45"

Do you have any more info on the Orca? Model, age, pictures of the repair?
Thanks

PM me and I'll send you a picture or three. I'm only going by what's on the label on the back. I've worn it to one event -- Escape from Florida this past April -- and a couple of times in the pool prior to that. Bought it gently worn last winter.

Thanks, I pm'ed you.