Big Feet Pajamas' red and black plaid (tartan) unisex onesie footie pajamas are a true classic! They are made of 100% cotton flannel and are double-brushed for added softness and comfort.
These pajamas button up the front and have non-slip soles. Big Feet Pajama flannel onesies are yarn-dyed and woven plaids versus the printed-on plaid designs of cheaper pajamas.

These onesies are available with or without a drop seat, trap door, butt flap:)

Unisex sizes XS through 2XL.  Please see the size chart image to find the proper size,  always selecting the larger size when 2 different sizes seem possible.