A woman facing you with open arms and legs and/or “looks” like she wants to give you a hug is a good indicator that she’s interested in you?
If you’re on a date with somebody then it usually is.
Well yeah, but if she agreed to go on a date with you, you already knew she was interested in you.
You don’t know if she’s romantically interested just from that.
Well if she wasn’t, why would she have agreed to go on a date with you?
For fun, or maybe it’s just a friendly date to her.