May I give you a tip? Buy your clothes in a store where you can go to a fitting room.
Why?
The clothing is either too small or too big.
My experience?
I bought 3 pairs of blue jeans online from Woman Within in the size 14 petite. They are way too small, yet I usually wear a 14 petite.
I bought 5 pairs of blue jeans from Poshmark.com in the size 16 petite. They are way too big for me!

Pexels
So, I bought a belt from Poshmark.com to use with my 16 petite blue jeans. The belt is way too big! So, yesterday, I gave a friend my belt to kindly create more holes in the belt so I can actually wear the darn 16 petite blue jeans!

Pexels
There is no "in-between" size for myself to buy.
Yes, one can always return the clothing via mail, but do you really want to go through all of that?
Just think out of the box My friend that is good with crafts and clothing, just happened to stop by my house and the lights went off! She said, "Sure"!
I just hate shopping in stores. How about you?