Is It Better to Buy a Hat One Size Up or True to Size?

June 16, 2026

This question only has a useful answer once you separate it by material — the right call for wool felt is the opposite of the right call for a stretch-knit beanie.

By Material Type

Structured felt/straw: Buy true to size. These materials don't stretch meaningfully, so an oversized purchase stays loose permanently.
Knit beanies (non-stretch wool): True to size, since wool knit has limited give.
Stretch-knit or acrylic blends: Sizing up slightly is more forgivable since the material stretches to conform over time.

Insight: The "size up to be safe" instinct common in apparel doesn't transfer well to structured hats — unlike a sweater, a felt hat won't shrink to fit, and an oversized one will always sit incorrectly.

Quick Reference

Material	Recommendation
Wool felt, straw	True to size, always
Non-stretch wool knit	True to size
Stretch-knit/acrylic	Sizing up is more forgiving

Bottom line: For structured materials, true to size is non-negotiable. Only stretch-knit fabrics offer real margin for sizing up.

Frequently Asked Questions

Should I size up for a hat if I'm between sizes?

For structured hats (felt, straw, rigid-brim caps): size down to the smaller. A slightly snug structured hat will break in minimally over wear; an oversized one never conforms and will always sit too high or shift. For stretch-knit beanies: size up — the stretch accommodates the larger measurement and the hat will conform comfortably. The direction to err depends entirely on whether the material has real stretch.

Will a felt hat stretch if I buy true to size and it feels snug?

Marginally. Wool felt has very limited stretch — a true-to-size hat may soften slightly at the sweatband over the first few wears, providing a small amount of additional comfort, but it will not meaningfully increase in size. A hat that is genuinely too small (painful, leaving a deep mark after 15 minutes) needs to be exchanged, not broken in. True to size means comfortable immediately, not painful but expected to loosen.

Is the "size up to be safe" rule from clothing a good guide for hats?

No — it actively works against you with structured hats. With a sweater or jacket, sizing up means extra fabric that drapes away. With a felt hat, sizing up means the hat sits higher on the head, gaps at the sides, or slides backward. The only hats where sizing up is useful are those with genuine material stretch, and even then, it's a specific material question, not a general hat-sizing principle.