7 Shocking Underwear Trends & Sales You Must Know For National Underwear Day 2025
National Underwear Day 2025 is set to be the biggest celebration of comfort, confidence, and self-expression in recent memory, moving far beyond a simple excuse for a sale. As we approach Monday, August 5, 2025, this annual holiday is transforming into a powerful movement centered on body positivity, technological innovation, and sustainable fashion choices, making it the perfect time to audit your drawer and upgrade your essentials.
This deep dive into the 2025 celebration will uncover the surprising history of the day, the cutting-edge trends dominating the market right now—from silky Micro Modal fabric to the rise of the women's boxer—and exactly which major retailers are predicted to drop the most irresistible deals for the ultimate underwear refresh.
The History and Meaning of National Underwear Day (August 5, 2025)
National Underwear Day is not a centuries-old tradition; it is a surprisingly modern holiday with a clear commercial origin that has evolved into a cultural moment. The day was officially founded in 2003 by the online underwear retailer Freshpair.
The original purpose was simple: to celebrate the undergarment as the most important piece of clothing people wear and to encourage a focus on fit, comfort, and personal expression.
Today, the holiday's meaning has broadened significantly, becoming an unofficial rallying cry for self-love and body acceptance. It encourages people to confidently wear whatever makes them feel good, regardless of size, shape, or style. The celebration is marked by major retailer sales, social media campaigns using the hashtag #NationalUnderwearDay, and events promoting positive body image.
The 7 Biggest Underwear Trends Dominating 2025
The underwear market in 2025 is less about restrictive lace and more about performance, comfort, and conscious consumption. Technological innovation and a strong focus on sustainability are driving the most significant shifts in style and fabric.
Here are the seven key trends that will define your drawer in 2025 and beyond:
- The Rise of Seamless and Lightweight Technology: "Seamless underwear" and "lightweight" construction are high-frequency terms defining the market. Brands are prioritizing designs that eliminate visible panty lines (VPL) and feel like a second skin, making them perfect for athletic wear and tight-fitting clothes.
- Micro Modal and Tencel Fabrics: The demand for ultra-soft, silky materials is soaring. Micro Modal and Modal are prized for their non-pilling, breathable, and incredibly soft texture, often marketed as "Second Skin" fabrics for men's briefs and boxer briefs.
- The Sustainability Imperative: Consumers are increasingly demanding eco-friendly options. This has led to a major trend in materials like Organic Stretch Cotton and the use of recycled materials, with brands like Parade leading the charge in conscious production.
- Boxers for Women (and the Boyshort Comeback): The line between men’s and women’s styles is blurring. Women’s boxers and comfortable boyshorts are gaining massive popularity, prioritizing comfort and coverage over traditional femininity.
- The Unstoppable Boxer Brief: For men, the Boxer Brief remains the undisputed champion. It is universally considered the "everyday essential" and the most versatile style, offering the perfect blend of support and coverage. Trunks, a shorter version of the boxer brief, also continue to be popular, especially for slimmer silhouettes.
- Inclusivity in Sizing and Design: Inclusivity is a major trend for 2025, extending beyond just offering plus sizes. Brands are focusing on curve-hugging cuts, a wider range of fits, and body-positive messaging, epitomized by campaigns like Aerie’s body-positive launches.
- Performance-Focused Fabrics: Technological innovation is bringing performance elements to everyday underwear. This includes features like moisture-wicking, anti-odor, and quick-drying properties, moving functional underwear out of the gym bag and into the daily rotation.
How to Snag the Best National Underwear Day 2025 Sales
Since National Underwear Day falls on August 5th, it is strategically positioned as a perfect back-to-school and end-of-summer shopping event. Retailers consistently use this day to clear inventory and offer deep discounts. While specific 2025 deals have not been announced yet, we can predict the sales based on the consistent patterns of major brands.
Predicted Sales and Deals for August 5, 2025:
Expect deals to run for the entire week leading up to and following the August 5th date, with the biggest discounts dropping on the day itself.
- Victoria's Secret / PINK: Historically, VS and PINK offer major bundle deals. Look for the "5 for $30" or "7 for $35" deals on their popular bikini, thong, and hipster styles. They often include a free panty with a bra purchase.
- Aerie (American Eagle): Aerie is a major player, focusing heavily on comfort and body positivity. Predict a "Buy 3, Get 3 Free" or "All Undies $5" promotion, especially on their highly-rated seamless and cotton styles.
- Calvin Klein (CK): CK sales typically focus on their iconic men's Boxer Briefs and classic cotton women's styles. Expect 30-50% off select packs of multiple items, which is the best time to invest in their classic logo waistbands.
- DTC (Direct-to-Consumer) Brands: Newer, trendier brands like Parade, ThirdLove, and Savage X Fenty will likely offer sitewide discounts of 20-35% off, often paired with free shipping or a free gift with purchase to drive new customer acquisition.
- Jockey and Hanesbrands: These heritage comfort brands will focus on bulk savings. Look for "Save $10 on a 6-Pack" or "2-for-1" deals on their classic briefs, trunks, and essential cotton underwear.
Checklist for a 2025 Underwear Drawer Upgrade:
Celebrating National Underwear Day is the perfect excuse for a clean slate. Follow these steps to ensure your drawer is aligned with the 2025 trends:
- The Cleanse: Throw out any underwear with holes, stretched elastic, or permanent stains. A good rule of thumb is to replace underwear every 6-12 months.
- The Comfort Test: Purchase at least one pair of high-tech comfort fabrics, such as Micro Modal or Tencel, to experience the 2025 focus on "second skin" softness.
- The Trend Investment: Try a new style you haven't worn before—perhaps a high-rise bikini, a seamless thong, or a pair of men's trunks instead of your usual boxer briefs.
- The Body Positivity Post: Embrace the spirit of the day. Whether you post an outfit picture showing a hint of a new waistband or simply take a private "underwear selfie," use the day to appreciate your body and your confidence.
National Underwear Day 2025 is more than just a date on the calendar; it’s a modern celebration of personal comfort, style, and self-acceptance. By focusing on the latest trends in sustainable fabrics and seamless technology, and by planning your purchases around the predicted August 5th sales, you can ensure your undergarments are as fresh, comfortable, and confident as you are.
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