What is the appropriate garb for Medieval period sidesaddle attire?
That depends upon the period and the “role” being played. Generally speaking, unless the rider is planing on portraying nobility on parade, then the dress for riding sidesaddle is the same as any period attire used for work or hunting. Earthtone fabrics made out of mid to heavy weight wool or linen would be appropriate. It should be something sturdy. The outfit should include some kind of protection for the legs like heavy hose or simple pants. You’ll want to avoid lots of fancy trim, too. Trim was expensive and generally not used on work/hunting garments. If you are planning on portraying nobility on parade, then things are going to be a bit different. These outfits are an excuse to go all out, though, I would still stick to the hardier weight fabrics. Silks, cottons, light weight wool’s, and velvets would all be appropriate. For ease of care I would avoid the lighter colors, but most any period color would be appropriate (No neon’s please.). For these you’ll want to make sure you hav