SuperBuy Sizing Guide: How to Never Get the Wrong Size

Getting the wrong size is the single most common reason for buyer regret. This guide breaks down sizing by category so you can measure once and order correctly.

The Universal Sizing Rule

Never trust the tagged size. Always measure a similar item you already own, then compare against the seller's size chart. This rule applies to every category on the SuperBuy Spreadsheet.

Shoes: Measure Your Foot, Not Your Shoe

Shoe sizing is the most confusing category because Chinese sellers use different size systems. Here is the only method that works:

1. Place your foot on a piece of paper and trace the outline
2. Measure the longest distance from heel to toe in centimeters
3. Compare that number to the seller's insole length chart
4. Add 0.5-1cm if you prefer a loose fit

Common Shoe Sizing Mistakes

• Using your US shoe size directly without checking the insole length
• Ignoring that different batches have different lasts
• Forgetting that some shoes run narrow, especially Jordan 1s
• Not accounting for thick socks on winter boots

Hoodies and Sweaters: Focus on Sleeve and Length

Oversized fits are popular in streetwear, but oversized means different things to different sellers. The key measurements are:

• Chest width: How wide the body is across the chest
• Sleeve length: From shoulder seam to cuff
• Body length: From shoulder seam to hem
• Shoulder drop: How far the shoulder seam extends past your actual shoulder

Hoodie Sizing Tips

• For a standard fit, order your true chest measurement
• For an oversized fit, add 10-15cm to the chest measurement
• Check the fabric weight: heavier fabrics drape differently
• Sleeve length matters more than body length for oversized looks

Pants and Shorts: Inseam Is Everything

Pants are the most returned category. The reason is simple: buyers do not measure their inseam.

How to Measure Your Best-Fitting Pants

1. Lay the pants flat on a surface
2. Measure the waistband across and double it
3. Measure the inseam from the crotch seam to the hem
4. Measure the rise from the crotch to the top of the waistband
5. Measure the thigh width 10cm below the crotch

Pant Sizing Mistakes to Avoid

• Using jean size instead of actual measurements
• Ignoring the rise measurement, which determines where the waist sits
• Assuming all cargo pants fit the same
• Not checking if the item is cropped or full-length

T-Shirts: Simple but Tricky

T-shirts are the easiest to size, but shrinkage can change everything after the first wash.

• Measure a t-shirt that fits you well after washing
• Add 2-3cm to account for shrinkage on cotton items
• Check if the item is listed as "oversized" or "standard fit"
• For vintage washes, expect slightly more shrinkage

Jackets and Outerwear: Account for Layers

Jackets need to fit over other clothes, which means you need extra room.

• Measure wearing a hoodie underneath if you plan to layer
• Add 5-8cm to your chest measurement for winter jackets
• Check the sleeve length with arms slightly bent
• Puffer jackets have different sizing because of the fill volume

Headwear and Accessories

Caps and beanies use different sizing systems. Caps are usually one-size-fits-all with adjustable straps. Beanies are stretchy but check the cuff length. For bags, dimensions are more important than weight.

Size Conversion Charts

US to CM conversion for reference: - US 8 = 26cm insole - US 9 = 27cm insole - US 10 = 28cm insole - US 11 = 29cm insole - US 12 = 30cm insole

For clothing, the conversion between US and Asian sizing is not linear. Always rely on the seller's chart, not a universal conversion.

Final Checklist Before Ordering

• Measure your reference item
• Compare against the seller's chart
• Check recent Reddit reviews for sizing feedback
• Add a small buffer for shrinkage or layering
• If between sizes, size up for comfort