Naga-juban kimono are underwear kimonos, often with fabulous textile art on them. They also make lovely house/bath robes.

Japanese clothing is usually of adjustable fit, being mostly wrap-over or tie-to-fit items, so most garments fit a range of sizes. The are held closed with an oi sash, always bought separately, 9cm deep sahses hold them well.

I can't really advise anyone on the fit. Please judge fit from the measurements given. Check length given for the garment, then measure from base of back of your neck down to judge that length on you.

Also measure from centre back of neck, along shoulder and down the arm to the wrist, then double that and compare it with the sleeve end measurement to judge sleeve length.

Storage: Hang up your garment for a few hours prior to wearing, to remove fold creases. They should also be hung out to air 4 times per year, if not worn frequently. Hang your garment to air for a day or so immediately after purchase too, as it will have been stored for a while. Some of my garments have white stitching (shitsuke) round the outside edges to keep the edges flat during long periods of storage, these stitches just get pulled out before wearing the garment.

Cleaning: Be very cautious about washing kimonos. All cleaning is done entirely at your own risk, as is standard with all vintage garments and items. I would advise only dry cleaning but select your dry cleaner carefully and take their advice before deciding. 

Colour: Please be aware that different monitors display colour slightly differently. Therefore the colour in the photos and description is a guide only.