A tailor''s trouser length and cuff marker comprising a baseboard having indicia related to trouser lengths and cuffs, and having a device for positioning marked trouser''s legs thereon in relation to said indicia. Spaced above the base, for positioning over the trousers is a two-part adjustable guide one part of which is hingedly mounted to the base to enable the guide to be raised and lowered. The other guide part has a straight-edge to guide a marking chalk or crayon. The two parts are adjustably connected to enable the straight-edge to be variously positioned for effecting different markings on the trousers. In conjunction with the baseboard and two-part guide there is also a trouser marker device adapted to stand on the floor and extend upward alongside the leg of a customer who has donned the trousers for measuring purposes. The marker device has an upright post on which there is carried a vertically movable slider provided with a stapler. The post and slider have cooperable indicia arranged to provide for short, medium or long trouser lengths, either with or without cuffs. By setting the slider to the particular indicia which corresponds to the customer''s choice, the stapler will be properly positioned the right distance above the floor surface; it is then used to apply a staple to the crease portion of the trousers. Then the customer removes the trousers, and the applied staple now constitutes a correctly placed marker for providing the desired trouser length, either with or without cuffs. Such a marked pair of trousers, when placed on the baseboard and utilized with the two-part guide, can now be accurately chalked or lined so that, for either cuffs or no cuffs as desired, the proper cut off and folding can be effected.