Let's look at this verse in three parts. First:
"Strength and dignity are her clothing ..."
What comes to mind is a picture of a woman in perfect health of mind and spirit, with strong quality of character as her adornment. Just as Paul admonishes us in the 6th chapter of Ephesians to clothe ourselves in spiritual armour and cover it all with a shield of faith, everything about the Proverbs 31 woman is based upon her spiritual health. She has wholeness and wellness of being, through and through.
She is strong, due to her faith in God and her daily walk in righteousness. This in turn gives her confidence, which leads to the latter phrases of this verse regarding her strong position and hopeful future. She is dignified as she maintains her self-respect and carries herself with dignity at all times: in her manner, her speech, and her demeanor. This is reflected partially in her outward appearance which, as we mentioned earlier, mirrors a person's internal well-being. The Proverbs 31 woman is always appropriately dressed and tended, never needing any overdone "adornment" in hair or dress. Such things are often subconsciously used to distract others from negative things in a person's character; things that might otherwise be more apparent without the "bangles and beads." Such is never the case with the Proverbs 31 woman, who is well-grounded in the Lord and lives her life as such.
Secondly, "... her position is strong and secure ..."
This comes, again, from being grounded in the Lord, grounded in her faith, and confident in her way of living which she knows reaps good things in her life. She is not weak or weary, for she lives righteously, and her heart does not condemn her when she asks anything of God. In other words, she has a clear conscience. She knows that in any adverse situation, she can confidently pull through; she never fears condemnation upon herself or her household, for all her thoughts and actions are with and for God (see verse 18). She has complete assurance before God for his absolute help and intervention, as in 1 John 3:21,22:
"And beloved, if our consciences (our hearts) do not accuse us -- if they do not make us feel guilty and condemn us -- we have confidence (complete assurance and boldness) before God;
And we receive from Him whatever we ask for, because we (watchfully) obey His orders -- observe His suggestions and injunctions, follow His plan for us -- and (habitually) practice what is pleasing to Him."
In her faith, the Proverbs 31 woman knows that, in having done all any situation demands, she need only stand and await God's answer to prayer (see Ephesians 6:13-17), knowing that whatever His answer may be, it is for her spiritual good (see Romans 8:28). It is only when we act sinfully or under or own understanding, rather than as we know God would have us do, that our position is weakened and may invite discipline from God, who does discipline those whom He loves. (See Proverbs 3:12 and Hebrews 12:6,7.) By contrast, the Proverbs 31 woman lives profitably due to her godly wisdom and understanding; she learns God's precepts in His Word and leads her life according to them, and thus avoids snares and pitfalls meant for hers or her family's destruction.
And finally the third part of this verse:
" ...She rejoices over the future -- the latter day or time to come (knowing that she and her family are in readiness for it)!"
The Proverbs 31 woman looks forward to days to come here on earth. She is confident that she and her family will enjoy good days spiritually and walk through adversity with God's love and help, for through faith in God and living righteously they are spiritually prepared.
Note that the Amplified translation states that she knows her family is "in readiness for" the future. She has confidence that her children will fare well in their lives here on earth, even after she is gone, for she knows she has taught them well in the ways of God. Her confidence, again, is due to her diligent faith; she takes nothing into her own hands, but instead does everything only with God's guidance, and can therefore boldly face the future. It's important to note that she passes God's ways of righteousness onto her children by teaching them. However, if her husband is in need of such, she provides it only by example and through prayer, never by admonition or discussion (see 1 Peter 3:1,2), unless he asks for her advice.
Ultimately, the Proverbs 31 woman has no fear of judgment day, for she and her family are spiritually ready for Christ's coming. Only in this state can one truly face the future with firm confidence, and rejoice over it!