FN-THL-101 - Waffle Knit Long-Sleeve Thermal - Black cb_popup_dec23 which is one down from

which is one down from he typically wears in Flat Head's Block Check Flannels in the Western cut

It's possible you can size down as well if you want a slightly slimmer profile

making this suitable for those with larger thighs

but not super tight)

FN-THL-101 - Waffle Knit Long-Sleeve Thermal - Black cb_popup_dec23 which is one down fromThe Flat Head Waffle Knit Long Sleeve Thermal in Black is a comfortable and excellent warming layer that is soft and stretchy, and can be versatile as both a base layer or as your primary layer. Constructed with their triple needle stitched collar for a tight neck opening, these have a beautiful micro waffle structure with high elasticity in the body to make this comfortable in the width (chest torso), but still appropriate in the length without