The shirt is an SA shirt. It's hard to say from the photos, but on the other posting about this jacket it appears there are holes from buttons for straps much longer than the straps currently on the shirt. Difficult to tell from the photos but it appears that the straps are folded over and sewn, not sewn into the seam where the shoulder and sleeve meet. The shirt being SA and the attachment of the straps in that manner seem odd to me. All the items appear good, just some things I've noticed about the combination.
There have been two other sets of Bann J straps with this rank from Wietze in the last weeks. I don't know if I would call it a "Hortfund" but this is the third set I've seen for sale recently, and believe me I've searched for a set of Bann J straps for years now, and they never seem to show up for sale, but three pairs recently is odd. I will add that all I've seen including these look original to my eyes.