There are a few questions that need to be answered before choosing the right pant size and they are:

What is your inseam size?

This is the length of the leg of your pants.  Most retailers only offer inseams down to 30 inches so you have never really seen sizes that are made for you (without tailoring).  See below to find your inseam.

Measuring:  Put on a pair of pants and flip the cuff up to your desired length. Take off the pants and measure the length of the cuff you flipped. Subtract that number from the pant's length size. For example, if you put on pants with a 30" inseam and you flipped the cuff up 3 inches, order the 27" inch inseam length from Under 510. 

Don’t Want to Measure Your Inseam?  Use our SUGGESTED sizing:

 Up to 5’4"
26” inseam 
27” inseam
28” inseam
29” inseam


What is your waist size?

If you aren’t sure, you can take a tape measure and wrap it around your waistline where you normally wear your pants. Subtract 4 inches from that measurement to get your pant waist size.  

Pant Sizing Variations:  Since different fabrics will fit differently, we recommend the following sizing adjustments for each of our pants.

Jon: Runs slimmer than our other pants. Our recommendation: For thin builds, order your normal waist size. For average or athletic builds, size up one waist size. If you are brawny, size up two waist sizes. 

Bruce: Runs true to size. Our recommendation: For thin, average, athletic builds, buy your normal waist size. For brawny builds, size up 1 waist size. 

Kingston: Has extremely stretch fabric. Our recommendation: For slim and average builds, size down on the waist. For athletic and brawny builds, order normal size. 

Simon: Runs true to size. For all builds, order your normal waist size.  

Getaway: Runs slim on the leg - For slim and average builds order your normal waist size. For athletic and brawny builds size up on the waist. If between sizes, size up.



Our shirts are sized to fit a shorter man properly. We designed our shirts to fit and feel like a custom tailored shirt. The shirts are made and proportioned specifically for men under 5'10. Our cut is narrower through the shoulders, slimmer through the torso, and shorter overall in length. 

Shirt ComparisionShirt from a mainstream store vs. Under 5'10 Shirt. Model is 5'2 and both shirts are size medium and are buttoned together.





37.5" 40.5" 43.5" 46.5" 49.5" 52.5"


31" 31.5" 32" 32.5" 35" 36"









26.5" 27" 27.5" 28" 29" 30"


For Neck Size: 
Check the collar size of your favorite dress shirt or measure around the base of your neck. 

For sleeve length:
Check the sleeve length of your favorite dress shirt or bend your arm at 90 o and measure from the base of your neck over your shoulder and elbow to your wrist.

Body Length:
Body length is measured from the center back base of the neck to the bottom hem of the shirt.  

For any sizing, styling, or general inquiries, please contact us at