100 Pieces Translucent Paper Vellum Envelopes 5.3 x 7.3 Inch Envelopes for Invitation Postcard Envelopes White Translucent Vellum Jackets Greeting Card Envelopes for Wedding Birthday Party : Amazon.co.uk: Stationery & Office Supplies
Crown Mill A4 Envelopes -
Colorplan Vellum White 133 x 184mm Envelopes (fits 5 x 7 inch)
Bekecidi 50 PCS Envelopes for Invitation, Translucent Vellum Envelopes Glassine Envelopes Clear Wedding Envelopes Blank White Paper Envelope for Greeting Card, Postcard, Photo (17.5x12.5cm) : Amazon.co.uk: Stationery & Office Supplies