The answer to OP's query was not as simple as I first thought it would be. Very useful finds on this search. Thanks for the question.
Several commentaries mention OP's observation:
Ellicott's Commentary for English Readers
(1) And in that day seven women . . .—The chapter division wrongly separates this verse from the foregoing. It comes as the climax of the chastisement of the daughters of Zion, as the companion picture to Isaiah 3:6.
Matthew Henry's Concise Commentary
4:1 This first verse belongs to the third chapter.
Barnes' Notes on the Bible
In that day - The time of calamity referred to in the close of the previous chapter. This is a continuation of that prophecy, and there was no reason why these six verses should have been made a separate chapter.
However, found a PDF of the 1st Edition of SBL's (Society of Biblical Literature) Handbook. In this edition (1999), Appendix E has the Heb.-Eng.-Gr. versification list. (In 2nd Ed., it's App. B.)
9:1 -- 8:23
9:2–21 -- 9:1–20
63:19 -- 63:19a
64:1 -- 63:19b
64:2–12 -- 64:1–11
JPS (Jewish Publication Society) Tanakh 1917 - Isa. 4
1 And seven women shall take hold of one man in that day, saying: ‘We will eat our own bread, and wear our own apparel; only let us be called by thy name; take thou away our reproach.’
Since so many think Isa. 4:1 belongs in Ch. 3, began looking for a reasons that Hebrew texts chose otherwise.
Found this on a Bible verse study:
"Pay careful attention to the images Isaiah created in this short chapter. Unlike the women at the end of Isaiah 3, the women described in Isaiah 4 are humble."
The Parable of the Defiant External Church (Isaiah 4:1)
All along in Isaiah 1, 2 and 3, the language has been difficult because God has been speaking in parabolic language. But here, in chapter 4, just in that first verse, God gave us a complete parable that describes to a tee the condition of the Church in the Final Tribulation Period. This is the sixth time that God says “In That Day”. Here God does not focus on Judgment Day itself, but on the Final Tribulation Period, which is the last event just preceding Judgment Day.