In the Harry Potter Movies (2001-2011), Snape's costume was the only one that never changed. According to costume designer, Jany Temine:"Because, it was perfect. When something is perfect you cannot change it.”
Severus Snape Costume - Harry Potter. 24hr Delivery | Funidelia
Harry Potter Child Severus Snape Costume | eBay
Funidelia | Severus Snape Costume - Harry Potter for man Wizards, Gryffindor - Costumes for adults, accessory fancy dress & props for Halloween, carnival & parties - Size L-XL - Black :
Harry Potter Childrens/Kids Severus Snape Costume | Discounts on great Brands
Harry Potter Child Severus Snape Costume
Severus Snape Costume | Matthew Wells | Flickr
Harry Potter Snape Costume | very.co.uk
Full View Snape Costume by ShadowWalkerInc on DeviantArt