We had a Mother/Daughter Tea at our church a couple of weeks ago, (the second tea we've had) and since it was a "tea", you do kind of dress up. I think it started with ladies over in England a long time ago. The ladies always "dressed" for tea, some even wearing hats and gloves for the occasion, at that time. (But no one wears hats and white dress gloves,now, except maybe, MAYBE the Queen of England, and I'm glad we don't!)
But it was nice and the ladies loved it! They even like the dressing up part, and dressing up their daughters, especially the little girls. They took pictures, too. So we have a good memory in a photo of us Mothers and our daughters all dressed up at a "Tea."
Some did wear dresses. Some wore dress pants and a nice top. I was one who wore a suit. My daughter wore a skirt and blouse. So, it sounds like your dress pants and a pretty blouse will be perfect! Make it as colorful as you can, in case they do take pictures.
Some ladies brought their own camera and took photos. Then one sweet lady sent us an email of her photos. It was really nice of her to do that. Maybe someone there will take and share photos, too.
Let us know what you decide to wear. It sounds like any of those blouses will look very pretty! (Just keep in mind, this is kind of a social event for the ladies. Probably no men will attend, since it is a tea.)
My favorite scripture: Malachi 3:16
"Then they that feared the LORD spake often one to another: and the LORD hearkened, and heard it, and a book of remembrance was written before him for them that feared the LORD, and that thought upon his name!" (Every time we speak of the Lord, or even THINK of him--its written down in a book of remembrance!)