Welcome to DENNIS! Based in Portland, Oregon, USA, we’ve been designing uniforms and uniform programs for nearly a century. We’re proud to partner with schools and families as they work to bring their educational vision to life.

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Sizing & Fit Hub

At DENNIS, we know that sizing and fit are critical. With all of our sizing resources, we are here to help you choose the right size for your child. We have videos, downloadable tools, comparison photos, and even some DENNIS kids modeling. Know that if you still have questions, our National Customer Service team is here to assist you via email, phone, and live chat!


Watch our How to Measure Video



How to Measure:

  • 1. Height: Stand tall (no shoes) and measure from top of head to floor.
  • 2. Weight: In pounds.
  • 3. Chest: Measure at the fullest part.
  • 4. Waist: Measure at the narrowest part.
  • Record your measurements, then use our Size Charts (below) to find the best size!
  • Between sizes? Order a size up to ensure the best, longest-lasting fit.




Measuring Tools & Tips


Need a tape measure? We made you a printable one!


No printer? No problem. There are several alternatives.

  • Use a string or (hair or gift wrap) ribbon to measure instead. For the ruler, you can use your phone or even standard notebook or printer paper (letter size is 8-1/2” x 11”).
  • Your phone may already have a measuring app.
  • There are several downloadable phone apps for taking measurements.


Size Charts


Size Chart Girls Juniors

Mobile-friendly Girls & Juniors Size Chart


Size Chart Boys Men

Mobile-friendly Boys & Men's Size Chart


Size Chart Hosiery

Mobile-friendly Hosiery Size Chart


Product Fit Tutorial Video Gallery


Not sure what size to order? We created Fit Tutorials for some of our most popular products. View the Fit Tutorial Playlist

Girls Polo Fit Tutorial


Unisex Polo Fit Tutorial


Girls Pants & Shorts Fit Tutorial

Boys Pants & Shorts Fit Tutorial

Girls Skirt & Skort Fit Tutorial



Top Polo Sizes

If you know how your student compares to other students in his or her grade, these charts may help indicate what size to buy. See what size other families purchased in your student’s grade level, using data from one million DENNIS polo sales. (Tip: The polo size that fits your student best will also be the best-fitting size in our DENNIS sweaters, sweatshirts and jackets!)


Girls Polo Sizes Purchased


Unisex Polo Sizes Purchased Girls Only


Unisex Polo Sizes Purchased Boys Only



Product Size Comparisons


Which size polo fits my child best? In addition to our size charts, here are DENNIS kids wearing our polos. You can see how the different sizes fit on each child.

Polo size comparison girls youth


Polo size comparison girls youth adult


Polo size comparison boys youth


Polo size comparison boys youth adult



Size Video Gallery


Our DENNIS parents were able to capture their kids modeling several of our most popular styles in the sizes that fit them best! View the Size Guide Playlist

Youth Small Girls Polo


Adult Small Girls Polo

Youth Large Short Sleeve Polo

Adult Medium Short Sleeve Polo


Girls 7 Irvington Shorts

Girls 12 Irvington Shorts


Boys 14 Irvington Shorts

Boys 24H Irvington Shorts


Boys 24 Husky Irvington Pants


Men's 33 Irvington Pants


Girls 7 Box Pleat Skirt

Girls 7 Box Pleat Plaid Skirt



Focused Presentations


Our "DENNIS Classroom" tutorials are designed for specific groups, pre-recorded by a DENNIS representative. View the Focused Fit Presentation Playlist

Shopping Tutorial for New Students, Kindergarteners & Preschoolers


Shopping Tutorial for Boys & Men



Other Helpful Tips


New to DENNIS? Watch our tutorial to get familiar with shopping our website.

Navigating the DENNIS Website